Chemical reactions, equations, bonding, periodic table and lab experiments
Discover the complete list of all 118 elements in the periodic table. Learn their chemical symbols, atomic numbers, and the Latin origins of strange symbols like Gold (Au).
Get the complete list of elements 1 to 30 of the periodic table, including their atomic numbers, symbols, and electronic configurations.
Learn the exact chemical differences between Acids and Bases. Discover how they taste, how they react to Litmus paper, and what ions they produce in water.
Learn the key differences between adsorption (a surface phenomenon) and absorption (a bulk phenomenon) with real-life examples like silica gel and sponges.
Aerated drinks contain CO₂ dissolved under high pressure, forming carbonic acid (H₂CO₃). When opened, pressure drops and CO₂ escapes as bubbles. Learn the chemistry of fizzy drinks.
Learn the chemical name for the symbol Ag on the periodic table. Understand why Silver is represented as Ag (Argentum).
Learn the colour of AgCl (Silver Chloride). AgCl is initially white but turns grey when exposed to sunlight due to photolytic decomposition. Class 10 Chemistry.
Airplane fuel is called Aviation Turbine Fuel (ATF) or jet fuel. The most widely used type is Jet A-1, a kerosene-based fuel with a freezing point below −47°C used in commercial aircraft.
Learn the chemical name of Al2(SO4)3, which is Aluminum Sulfate. Read about its uses in water purification and chemistry properties.
Learn alkane ka sutra (general formula). Alkane: CnH2n+2, Alkene: CnH2n, Alkyne: CnH2n-2. Class 10 carbon and its compounds formulas in Hindi.
Aluminium sulphate Al₂(SO₄)₃ is an acidic salt. In salt analysis: Al³⁺ gives white precipitate with NaOH, SO₄²⁻ gives white precipitate with BaCl₂. Learn with FAQs.
Learn the definition of ambidentate ligands in Class 12 Coordination Chemistry. Understand how SCN⁻ and NO₂⁻ can coordinate through two different atoms.
Learn the chemical formula for Ammonium Nitrate (NH4NO3). Understand its ions, properties, and common uses in fertilizers and explosives.
Learn the definition of amphoteric oxides and get the top examples. Understand how Al₂O₃ and ZnO react with both acids and bases.
Amphoteric oxides react with both acids and bases to form salt and water. Examples: Al₂O₃, ZnO, PbO, SnO. Reactions with HCl and NaOH explained.
Learn the electron configuration of Argon (Ar). 1s² 2s² 2p⁶ 3s² 3p⁶. Understand its inert nature, valency, and uses as a noble gas in Chemistry.
Atomic mass of magnesium is 24 u (precisely 24.305 u). Atomic number = 12. Electronic configuration: 2,8,2. Isotopes: Mg-24, Mg-25, Mg-26. Full chemistry facts.
Learn the exact atomic mass of Magnesium (Mg). Understand its mass number, number of protons and neutrons, and its position in the periodic table.
Learn the exact atomic mass of Manganese (Mn). Discover its atomic number, its transition metal properties, and its electron configuration.
Learn the definition of the atomic mass unit (amu or u). Understand why Carbon-12 is used as the standard reference for measuring atomic masses.
Atomic number of Mn (Manganese) is 25. Atomic mass = 55 u. Electronic configuration: [Ar] 3d⁵ 4s². Group 7, Period 4, d-block transition metal. Full chemistry facts.
Learn the atomic number of Na (Sodium). Understand its electronic configuration, chemical properties, and why it is highly reactive.
Learn the atomic number, atomic mass, and electronic configuration of Sulphur (S). Understand why sulphur has valency 2 or 6.
Learn how to calculate the number of atoms in 558.5 grams of Iron (Fe) using the mole concept and Avogadro's number. Step-by-step chemistry solution.
Helium has the smallest atomic radius (31 pm). Among non-noble gases, fluorine is the smallest. Learn atomic size trends in the periodic table with FAQs.
Learn what Baeyer's Reagent is in organic chemistry. Understand its composition (alkaline KMnO4) and how it is used to test for unsaturation (double bonds).
Learn 20 important balanced chemical equations for Class 10 Chemistry. Combustion, decomposition, displacement and combination reactions with answers.
BARF acronym chemistry stands for tetrakis(3,5-bis(trifluoromethyl)phenyl)borate — a weakly coordinating anion used in catalysis. Full meaning, structure & uses.
Learn the balanced chemical equation for the reaction between Barium chloride and Aluminium sulphate. Understand the double displacement precipitation reaction.
Learn the chemical formula of Barium Sulphate (BaSO4). Discover how it is formed through a precipitation reaction, its insolubility in water, and its uses.
Learn the chemical formula for Barium Sulphate (BaSO4). Understand its valency cross-over, why it forms a famous white precipitate, and its medical uses.
Learn the full form of BHC in chemistry. Understand the structure, uses, and environmental hazards of Benzene Hexachloride (Gammaxene).
Bleaching powder formula is CaOCl₂ or Ca(OCl)Cl. Chemical name: calcium hypochlorite-calcium chloride or calcium chlorohypochlorite. Full explanation with FAQs.
Bleaching powder (CaOCl₂) is used for bleaching cloth, disinfecting water, and manufacturing chloroform. Learn two main uses and all applications with FAQs.
Learn the chemical formula and name of Blue Vitriol. Find out how to calculate the molar mass of CuSO4 and CuSO4.5H2O.
Learn the bond order of CO using Molecular Orbital Theory. Understand why CO has a bond order of 3 and is isoelectronic with N₂.
Learn how to calculate the bond order of the Nitrogen molecule (N2) using Molecular Orbital Theory. Understand why N2 is so stable and unreactive.
Learn how to calculate the bond order of O2 (Oxygen molecule) using Molecular Orbital Theory. Understand why the bond order is 2 and why oxygen is paramagnetic.
Learn the meaning of brisk effervescence in chemistry. Understand why the rapid escape of gas bubbles occurs during chemical reactions, with examples.
Bromine trifluoride (BrF₃) undergoes auto-ionization: 2BrF₃ ⇌ BrF₂⁺ + BrF₄⁻. It acts as both a Lewis acid and base. Learn BrF₃ structure, reactions with Br₂ and F₂, and uses.
Learn about Bromoethane (Ethyl Bromide). Discover its chemical formula, structural representation, preparation, and uses in organic chemistry.
What is a burette in chemistry? Learn about its use in titration, how to read a burette diagram, and why it has a stopcock at the bottom.
Learn the scientific process of how butter is separated from milk or curd. Understand the principle of centrifugation and churning used in class 9 science.
Calcium bicarbonate formula is Ca(HCO₃)₂. It causes temporary hardness of water and exists only in solution. Learn its properties, reactions, and role in water hardness.
Learn the complete electron configuration of Calcium (Ca). Understand why Ca²⁺ ion has a noble gas configuration and its periodic table position.
Learn about CaOCl2 (Calcium Oxychloride), commonly known as Bleaching Powder. Discover its chemical properties, preparation method, and industrial uses.
Learn the chemical name of CaOCl2 (Calcium Oxychloride). Discover its common name (Bleaching Powder), how it is manufactured, and its major uses.
Carbolic acid formula is C₆H₅OH (phenol). IUPAC name: hydroxybenzene. Molecular mass: 94 g/mol. Carbolic acid is the common name for phenol. Properties and uses.
Learn the chemical formula for carbon tetrachloride (CCl4). Understand its tetrahedral structure, non-polar nature, and uses as an industrial solvent.
Learn about the Carbylamine reaction in organic chemistry. Understand how this test is used to identify primary amines by producing foul-smelling isocyanides.
Cations are positively charged ions (lose electrons); anions are negatively charged ions (gain electrons). Definition, examples Na⁺, Cl⁻, and differences explained.
Learn the full form of CBG. Discover what Compressed Bio Gas is, how it is produced from agricultural waste, and its benefits as a green automotive fuel.
Learn the 4 main characteristics of the particles of matter. Understand kinetic theory, intermolecular space, and forces of attraction.
What are the characteristics of particles of matter? Learn about empty spaces, continuous motion, and attraction between particles. CBSE Class 9 notes.
Charge on an alpha particle is +2e or +3.204 × 10⁻¹⁹ C. An alpha particle is a helium-4 nucleus with 2 protons and 2 neutrons, carrying a net +2 positive charge.
Learn exactly when a chemical reaction reaches equilibrium. Understand reversible reactions, dynamic equilibrium, and the rates of forward and backward reactions.
Learn the chemical name and formula of Quicklime. Understand its reaction with water to form slaked lime (exothermic reaction).
Quick revision notes for Class 10 Science Chapter 1: Chemical Reactions and Equations. Learn about balancing equations, combination, decomposition, and redox reactions.
Learn what a china dish is in chemistry. Understand its uses for evaporation, heating, and crystallization in the science laboratory.
Learn the chemical formula and charge of the Chloride ion. Understand the difference between Chlorine atoms and Chloride ions in ionic bonds.
Learn the meaning and full form of CNG (Compressed Natural Gas). Understand its chemical composition (methane) and why it is a clean alternative to petrol.
Learn how to draw the Lewis structure for CO2 (Carbon Dioxide). Understand its linear geometry, double bonds, and lone pairs on the oxygen atoms.
Learn the exact definition of a colloidal solution. Understand the difference between true solutions, colloids, and suspensions with everyday examples.
A colloidal solution has particles of 1–1000 nm that scatter light (Tyndall effect) and do not settle. Examples include milk, fog, blood, and smoke. It is a heterogeneous mixture.
Learn about the colour of CuSO4. Find out why hydrated copper sulphate is blue and why anhydrous copper sulphate turns white upon heating.
Learn the colours of Ferrous Sulphate and Lead Nitrate before and after heating. Essential observations for Class 10 Chemistry thermal decomposition.
Discover the colour of Zinc Sulphate. Learn why ZnSO4 crystals are colorless (white) and its applications in chemistry.
Misch metal contains ~50% cerium, ~25% lanthanum, ~15% neodymium, ~10% other rare earth metals. It is pyrophoric and used in lighter flints and steel. Full details with FAQs.
For a reaction A → B, determine rate law from experimental data: compare rates at different concentrations to find reaction order, then use Arrhenius equation for activation energy.
Learn the step-by-step organic chemistry conversion from Benzoic acid to Benzaldehyde using Rosenmund reduction. Important for Class 12 board exams.
300 K converted to Celsius is 26.85°C (approximately 27°C). Use the formula: °C = K − 273.15. Learn how to convert Kelvin to Celsius with examples and the temperature scale relationship.
573 K converted to Celsius is 300°C. Use the formula: °C = K − 273. Learn how to convert 573 Kelvin to Celsius with step-by-step calculation and temperature scale explanation.
Learn about Copper(II) Nitrate. Discover its chemical formula Cu(NO3)2, its beautiful blue color, and the chemical equation for its thermal decomposition.
When copper oxide is prepared by two methods, both samples have the same Cu:O ratio (4:1 by mass). This confirms the Law of Definite Proportions (Law of Constant Composition).
Learn the exact chemical formula for Copper Sulphate (CuSO4). Understand the difference between its anhydrous and hydrated (blue vitriol) forms.
Learn the definition of critical temperature. Understand why a gas cannot be liquefied above its critical temperature, regardless of the pressure applied.
Learn the de Broglie wave equation. Understand Louis de Broglie's theory of the dual nature of matter (particle and wave) and the formula for wavelength.
Learn the definition of a displacement reaction in chemistry. Understand how highly reactive metals displace less reactive metals using the reactivity series.
Learn the definition of Hybridization in chemistry. Understand how atomic orbitals mix to form sp, sp2, and sp3 hybrid orbitals, dictating molecular shape.
Learn the definition of a ligand in chemistry. Understand how molecules or ions donate electron pairs to a central metal atom in coordination compounds.
Learn the definition of a polyatomic ion in chemistry. Discover clear examples like Sulphate (SO4), Nitrate (NO3), and Ammonium (NH4) for Class 9 students.
Learn the definition and formula for the degree of dissociation (alpha). Understand its importance in weak acids, weak bases, and chemical equilibrium.
The density of petrol (gasoline) is approximately 0.71–0.77 g/mL (710–770 kg/m³). It is less dense than water, which is why petrol floats on water. Learn with FAQs.
Desiccated coconut is coconut flesh with moisture removed by drying at low temperatures. It preserves coconut by reducing water activity, inhibiting microbial growth. Used widely in food.
Learn the definition and difference between BOD (Biochemical Oxygen Demand) and COD (Chemical Oxygen Demand). Essential environmental chemistry notes.
Learn the difference between calcination and roasting in metallurgy. Discover how carbonate and sulphide ores are converted into metal oxides. Class 10 Chem.
Learn the difference between isotopes and isobars in chemistry. Understand atomic numbers, mass numbers, and clear examples like Carbon-12/14 and Argon/Calcium.
Learn the difference between Lanthanoids and Actinoids (f-block elements). Compare their oxidation states, radioactivity, and shielding effects.
Difference between orbital and orbit — an orbit is a fixed circular path of an electron (Bohr model), while an orbital is a 3D region of space where the probability of finding an electron is maximum.
Learn the difference between sigma and pi bonds in chemistry. Understand head-on vs lateral overlapping, bond strength, and molecular rotation.
Get a clear, tabulated difference between Solids, Liquids, and Gases based on shape, volume, compressibility, and particle arrangement for Class 9 Chemistry.
Learn the key differences between metals and non-metals. Compare their physical properties (malleability, conductivity) and chemical properties for Class 10.
Learn the structural and chemical reason why the dipole moment of NF3 is lower than NH3 despite Fluorine being more electronegative than Nitrogen.
Learn about Dobereiner's Triads in chemistry. Understand the first historical attempt to organize chemical elements based on their atomic mass and properties.
No — nitric acid does NOT turn red litmus blue. Nitric acid is an acid and turns BLUE litmus RED. Only bases turn red litmus blue. Learn why acids turn litmus red.
What is a double displacement reaction? Learn the definition with examples, such as the reaction between barium chloride and sodium sulphate.
Learn the chemical formula of dry ice. Understand sublimation, why it doesn't melt into a liquid, and its uses in cooling and stage effects.
Eggshell (CaCO₃) reacts with dilute nitric acid to produce calcium nitrate, water, and CO₂ gas. The eggshell fizzes and dissolves. Learn the equation and observations.
Learn about electrolytic refining of metals in chemistry. Understand the setup with anode, cathode, and electrolyte, and how impure copper is purified using this method.
Write the electron distribution in carbon and sodium atoms. Carbon: 2,4 and Sodium: 2,8,1 — complete shell configuration with Bohr model for Class 9 Chemistry.
Learn about Electron Donating Groups (EDG) in organic chemistry. Understand the inductive (+I) and mesomeric (+M) effects and how they activate the benzene ring.
Learn how to draw the Lewis electron dot structure of Ethanoic Acid (CH3COOH). Understand the covalent bonding, double bonds, and lone pairs of oxygen.
Learn how to easily draw the electron dot structure (Lewis structure) for Carbon Dioxide (CO2). Understand the double covalent bonds between carbon and oxygen.
Electron gain enthalpy is the enthalpy change when a neutral gaseous atom gains an electron. Chlorine has the most negative value (−349 kJ/mol). Periodic trend explained.
Copper (Cu, Z=29) has electronic configuration [Ar] 3d¹⁰ 4s¹, not [Ar] 3d⁹ 4s². It is an Aufbau exception due to extra stability of fully filled d-orbitals. Full config: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s¹.
Electronic configuration of first 30 elements: H to Zn. Full table with atomic number, element name, symbol, and electron configuration in shell and orbital notation.
Learn the exact electronic configuration of Scandium (Sc, Atomic Number 21). Understand the Aufbau principle, the Argon core, and the 4s/3d orbital filling order.
Learn the electronic configuration of Sulphur (S). Atomic number 16. Understand how electrons are arranged in shells (2,8,6) and orbital notation (1s2 2s2 2p6 3s2 3p4).
Complete list of elements 1 to 30: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn with names, symbols and properties.
Find a complete table of elements and their valency. Learn valencies of Hydrogen, Oxygen, Nitrogen, Carbon, and 20+ common elements for Class 9 Chemistry.
Learn how to calculate the empirical formula of a hydrated salt. Step-by-step guide on heating the salt, finding the mass of lost water, and calculating moles.
Learn the definition of Enthalpy of Atomisation. Understand why it is always positive (endothermic) and how it relates to bond strength and metallic bond energy.
Sparingly soluble salts establish ionic equilibria described by Ksp (solubility product). The common ion effect reduces solubility. Precipitation occurs when ionic product > Ksp.
Learn how to calculate Equivalent Weight in chemistry. Discover the formulas for finding the equivalent mass of acids, bases, and salts using the n-factor.
Estimate the change in enthalpy and entropy when liquid ammonia at −33.34°C vaporises. ΔH = 23.35 kJ/mol, ΔS = 97.4 J/mol·K. Step-by-step solution & formula.
Learn the chemical formula and draw the chemical structure of Ethanal (Acetaldehyde) and Ethylidene chloride. Important organic chemistry compounds.
Ethyl bromide (C₂H₅Br) is prepared from ethyl alcohol by reaction with HBr or PBr₃. Learn the equation, mechanism, and conditions with FAQs.
Learn the concepts of Eudiometry (Gas Analysis). Understand how to calculate the molecular formula of unknown hydrocarbon gases using combustion formulas.
Chemical changes produce new substances. Examples include burning, rusting, cooking, and photosynthesis. Learn the definition, features, and how to distinguish from physical changes.
Learn the definition of Deposition in chemistry (gas to solid). See real-life examples like frost on winter windows and the formation of snow in clouds.
Learn what metalloids are in chemistry. Discover famous examples like Silicon and Boron, and understand why they are crucial for computer semiconductors.
Learn the chemical definition of rancidity. Understand why chips, butter, and oils spoil and smell bad due to oxidation, and how nitrogen gas prevents it.
Understand the difference between exothermic and endothermic chemical reactions with simple examples like burning wood and melting ice.
Rancidity is the oxidation or hydrolysis of fats and oils, producing bad smell and taste. Prevented by antioxidants (BHA, BHT), nitrogen flushing, refrigeration, and airtight packaging.
Learn what a saturated solution is in chemistry. Understand solubility, unsaturated vs saturated, and what happens when you heat a saturated mixture.
Learn the step-by-step biological and geological process of how petroleum (crude oil) is formed from dead sea organisms over millions of years under extreme heat.
According to Fajan's rules, covalent bonding is favoured by a small, highly charged cation and a large, easily polarisable anion. Full explanation with examples.
Learn Faraday's Second Law of Electrolysis. When the same charge passes through different electrolytes, masses deposited are in proportion to their equivalent masses.
Learn the general electronic configuration of f-block elements (Lanthanides and Actinides). Understand their group, period, and inner transition nature.
Learn about Fermentation — the process by which yeast converts glucose (sugar) into ethanol (alcohol) and carbon dioxide. Includes the chemical equation.
Learn about the scientific uses of Filter Paper in the chemistry laboratory. Understand how its microscopic pores help in filtration and chromatography.
Learn which gas is used in standard fire extinguishers. Understand the chemistry of Carbon Dioxide (CO2) and how it suffocates massive fires by removing oxygen.
Memorize the first 20 elements of the periodic table. View the complete list with their atomic numbers and symbols, essential for basic high school chemistry.
Learn the first 20 elements of the periodic table. Memorize their atomic numbers, symbols, and discover a simple mnemonic trick to remember them easily.
Learn the first 30 elements of the periodic table with names, symbols, and atomic numbers. Complete list for Class 10 and 11 Chemistry with memory tricks.
Learn the mathematical formula for a first-order chemical reaction. Understand the integrated rate law, the rate constant (k), and the half-life equation.
Find the chemical formula of Fitkari, also known as Potash Alum. Learn its chemical name and common uses in water purification and shaving.
Learn about the Flame Photometer in analytical chemistry. Understand its principle, working, and how it is used to measure Sodium and Potassium in medical blood tests.
A football bladder contains equimolar amounts of nitrogen and CO₂. Using Dalton's Law: partial pressure of each gas = total pressure × mole fraction. Class 11 Chemistry.
Learn the general formula of amines. Understand primary, secondary, and tertiary amines, their structural formulas, and IUPAC naming conventions.
Learn the general formula of the Ketone functional group. Understand its structure and look at the simplest ketone: Acetone (Propanone).
Learn the chemistry of Fractional Distillation. Understand how this massive industrial process separates crude oil into petrol, diesel, and kerosene based on boiling points.
Learn what galvanization means. Understand how coating iron with zinc prevents rusting, the galvanization process, and why galvanized iron is used in construction.
Pure acetic acid is called glacial because it freezes at 16.6°C forming ice-like crystals. Learn the properties, freezing point, and uses of glacial acetic acid with FAQs.
Learn about the Glass Rod (Stirring Rod) used in chemistry laboratories. Discover why scientists use pure glass to mix highly dangerous, boiling acid chemicals.
Learn why graphite conducts electricity despite being a non-metal. Understand its layered structure, delocalized pi electrons, and how it differs from diamond.
H2O is the chemical formula for water. Its IUPAC name is oxidane. Molecular mass is 18 g/mol. Learn formula, properties, and uses of water.
H₂S is less acidic than H₂Te because S–H bond is stronger than Te–H bond. Down Group 16, bond dissociation enthalpy decreases, making H⁺ release easier. Full explanation.
Heating baking soda (NaHCO3) produces sodium carbonate, water, and CO2: 2NaHCO3 → Na2CO3 + H2O + CO2. Observe effervescence and white residue.
Learn the definition of a heterogeneous mixture in Chemistry. Explore common daily life examples like oil and water, soil, pizza, and muddy water.
Learn the definition of a heteroleptic complex. Understand the difference between homoleptic and heteroleptic complexes with examples from Class 12 Chemistry.
Learn everything about the Hinsberg Reagent (Benzenesulfonyl Chloride). Understand how the Hinsberg Test is used to accurately distinguish 1°, 2°, and 3° Amines.
Learn about the HLB (Hydrophilic-Lipophilic Balance) scale used in Chemistry and Pharmacy. Understand how surfactants mix oil and water in lotions and creams.
Learn how to calculate the molar mass (molecular weight) of HNO3 (Nitric Acid) step-by-step. Find out atomic masses of Hydrogen, Nitrogen, and Oxygen.
Learn how to easily calculate the valency of an element using its atomic number and electronic configuration. A simple guide for Class 9 chemistry students.
Learn the full form of HSD (High Speed Diesel) in petroleum engineering. Understand the massive difference between HSD and LDO (Light Diesel Oil) fuels.
Learn the definition of Hybridization in chemistry. Understand how atomic orbitals mix to form hybrid orbitals with identical shapes and energies.
Learn the definition of hydration enthalpy. Understand why it is always negative, its relationship with ionic charge and size, and its trend in the periodic table.
Learn the balanced chemical equation for Hydrogen combining with Nitrogen to form Ammonia. Understand the Haber Process conditions (Iron catalyst, high pressure).
Learn the definition of an Ideal Solution in chemistry. Understand how it obeys Raoult's Law at all concentrations and temperatures.
Understand the difference between ideal and non-ideal solutions in Class 12 Chemistry. Learn about Raoult's law, enthalpy, and volume changes upon mixing.
Learn about inner transition elements (f-block). Understand what lanthanides and actinides are, their position in the periodic table, and their key properties.
Learn the exact valency of the element Iodine in Chemistry. Understand why it has a primary valency of 1 and how it forms massive compounds like KI.
Ionisation enthalpy is the energy needed to remove one electron from a gaseous atom. It increases across a period and decreases down a group. Learn trends and anomalies with FAQs.
Understand the basics of the Iron-Carbon phase diagram. Learn about austenite, ferrite, cementite, and how carbon content transforms iron into steel.
Learn whether a cation is positively or negatively charged. Understand how atoms lose electrons to become cations, with examples like Sodium and Calcium.
Learn the exact definition of Isobars in Chemistry. Discover famous examples like Argon and Calcium, and understand the massive difference between Isotopes and Isobars.
Learn the definition of isodiaphers in nuclear chemistry. Isodiaphers are nuclides with the same neutron excess (N-Z). Find examples and related nuclear terms.
Learn the definition of isoelectronic species with examples. Also, understand the structure and names of the two isomers of butane (n-butane and isobutane).
Learn the exact definition of Isoelectronic Species in Chemistry. Understand how completely different atoms and massive ions can have the exact same number of electrons.
Learn the definition of an isotonic solution. Understand what happens to a plant or animal cell when placed in an isotonic environment.
Learn the clear difference between Isotopes and Isobars. Understand atomic number and mass number differences with easy examples like Carbon and Argon.
Learn about K4[Fe(CN)6], Potassium Ferrocyanide. Find the IUPAC name, oxidation state of iron, hybridization, and its use as a reagent in chemistry.
Learn how to calculate the molar mass (molecular weight) of Potassium Chloride (KCl) and Potassium Hydroxide (KOH) step-by-step.
Kohlrausch's law states that molar conductivity at infinite dilution equals the sum of individual ionic conductances: Λm° = λ+ + λ−. Used for weak electrolytes.
Learn the exact chemical formula of Laughing Gas (N2O). Understand its scientific name (Nitrous Oxide), its massive uses in surgery, and why it makes you laugh.
The law of constant composition states that a compound always has the same elements in the same ratio by mass. Copper oxide (CuO) always contains Cu:O = 4:1 by mass.
Learn the exact definition of the Law of Definite Proportions (Proust's Law) in chemistry. Understand the massive H2O water example for Class 9 and 11.
Learn the Law of Reciprocal Proportions (Richter's Law). If two elements A and B each combine with a third element C, the ratio A and B combine with each other is a simple multiple of their ratios with C.
Lead II nitrate and potassium iodide react to form a bright yellow precipitate of lead iodide. Balanced equation, type, observations, ionic equation & FAQs.
Learn the exact chemical equation for the massive reaction between Lead Nitrate and Potassium Iodide. Understand why a bright yellow precipitate (Lead Iodide) is formed.
When lead nitrate Pb(NO₃)₂ is heated, it decomposes giving yellow PbO, brown NO₂ fumes, and O₂. Equation: 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂. Learn with FAQs.
Learn how to draw the Lewis dot structure of CO2. Understand the double bonds, lone pairs on oxygen, and the linear geometry of carbon dioxide.
Lime water is a dilute aqueous solution of calcium hydroxide Ca(OH)₂. Learn the formula, preparation, and how lime water turns milky with CO₂ — with FAQs.
Learn which information is not conveyed by a balanced chemical equation. Discover the limitations of chemical equations like rate of reaction and feasibility.
Learn the major drawbacks and limitations of Bohr's Atomic Model. Understand why it failed for multi-electron atoms and the Zeeman effect.
Learn about Maleic Acid. Understand its chemical formula (C4H4O4), its cis-isomer structure, and its massive industrial uses in making polymers.
Find mass of KClO₃ to liberate 6.72 L O₂ at STP. Answer: 24.5 g. Step-by-step solution using 2KClO₃ → 2KCl + 3O₂ with mole concept.
Learn how to accurately calculate the massive Molar Mass of Urea (NH2CONH2). Understand the atomic weights of Nitrogen, Carbon, Hydrogen, and Oxygen.
Get the perfect board exam answer explaining why ionic compounds like NaCl have incredibly high melting points due to strong electrostatic forces of attraction.
Learn Mendeleev's Periodic Law. 'Properties of elements are a periodic function of their atomic masses.' Understand his predictions and limitations of his table.
Learn about Dmitri Mendeleev's Periodic Table. Understand its main features, the periodic law based on atomic mass, and its incredible achievements and limitations.
Zinc (Zn) is used for galvanising iron. Galvanisation coats iron with zinc to prevent rusting. Methods: hot-dip and electrogalvanising. Zinc is a sacrificial anode.
Methanoic acid (formic acid) formula is HCOOH or HCO₂H. It is the simplest carboxylic acid. Learn its structure, properties, occurrence, and uses with FAQs.
Learn the method to liquefy atmospheric gas. Understand how applying high pressure and lowering the temperature changes gases into liquids (Class 9 Chemistry).
Learn the colour of methyl orange in acidic and basic solutions. Understand why it changes from red to yellow and its use in titrations.
Milk is a colloid — specifically an emulsion. It is a heterogeneous mixture of fat droplets dispersed in water. Learn why milk is a colloid with FAQs.
Learn the MO diagram of O₂ (Oxygen molecule). Calculate its bond order of 2 and understand why it is paramagnetic with 2 unpaired electrons.
Learn the formula for Molar Conductivity (Λm) in electrochemistry. Understand how it relates to specific conductivity and the concentration of the electrolyte.
Molar mass of acetone (CH3COCH3) is 58 g/mol. Calculated as 3C + 6H + O = 36 + 6 + 16 = 58. Learn acetone's formula, structure, and properties.
Learn exactly how to calculate the molecular mass of Benzene (C6H6). Discover why the final mathematical answer is exactly 78.11 g/mol.
Learn the exact molar mass of Chlorine atom (Cl) and Chlorine gas (Cl2). Understand how to calculate it from atomic mass values.
Learn how to calculate the molar mass of CO (Carbon Monoxide). Find the exact atomic weights of Carbon and Oxygen to get 28 g/mol.
Learn how to calculate the molar mass (molecular mass) of Ethylene Glycol. Understand its chemical formula (C2H6O2) and step-by-step calculation.
Find the molar mass of H2 (Hydrogen gas). Learn the simple calculation to determine why the molecular mass of H2 is 2.016 g/mol.
Learn how to calculate the exact molar mass (molecular weight) of H2SO4 (Sulfuric Acid) step-by-step. Discover why the answer is 98 g/mol for chemistry exams.
Learn how to calculate the exact molar mass (molecular weight) of KMnO4 (Potassium Permanganate) step-by-step. Discover why the answer is 158 g/mol.
Molar mass of urea (NH2CONH2 or CH4N2O) is 60 g/mol. Calculated as C + 4H + 2N + O = 12 + 4 + 28 + 16 = 60. Learn urea's formula, structure, and uses.
जानें मोलरता किसे कहते हैं (What is Molarity in Hindi)। मोलरता का सूत्र (Formula) और इसकी परिभाषा। कक्षा 11 और 12 रसायन विज्ञान।
Learn step-by-step how to calculate the relative molecular mass of Ammonium Dichromate (NH4)2Cr2O7. Clear atomic mass breakdown included.
Molecular mass of CaCO3 (calcium carbonate) = 100 g/mol. Step-by-step calculation using atomic masses of Ca, C, and O. Class 9–11 Chemistry.
Learn to calculate the molecular mass of CH4 (Methane). Understand the atomic masses of Carbon and Hydrogen to get 16 u.
Learn the step-by-step calculation for the molecular mass of Ethanol (Ethyl Alcohol). The exact molar mass is 46.07 g/mol.
Find the molecular mass of HCl. Learn how to add the atomic mass of Hydrogen (1 u) and Chlorine (35.5 u) to get 36.5 u.
Learn how to calculate the molecular mass of Na₂SO₄ (Sodium Sulphate) step by step. The answer is 142 g/mol.
Molecular mass of NaOH (sodium hydroxide) = 40 g/mol. Calculation: Na (23) + O (16) + H (1) = 40. Uses of NaOH and related Class 10 Chemistry concepts explained.
Calculate the molecular weight of CaCO₃ (Calcium Carbonate). Step-by-step solution gives 100 g/mol — the easiest molar mass to remember.
Learn the molecular weight of HNO₃ (Nitric Acid). Step-by-step calculation gives 63 g/mol with atomic masses of H, N, and O.
Molecular weight of NaOH (sodium hydroxide) = 40 g/mol. Step-by-step calculation: Na (23) + O (16) + H (1) = 40. Uses and properties of NaOH.
What is the difference between a molecule and a compound? Learn why all compounds are molecules, but not all molecules are compounds.
Learn the definition and formula for mole fraction of solute. Understand how it is calculated and its relationship with mole fraction of solvent.
Mortar and pestle (ओखली और मूसल) is used for grinding, crushing, and mixing substances in chemistry labs and kitchens. Types, uses, materials, and labware details.
Learn which is the most reactive metal. Understand the reactivity series of metals and why Caesium and Potassium are at the top.
Learn the Lewis structure and resonance of the N3⁻ (azide ion). Understand its linear shape, bond order, and formal charge distribution.
Na2CO3 is sodium carbonate, commonly known as washing soda. Molecular mass 106 g/mol. Hydrated form is Na2CO3·10H2O. Learn its properties and uses.
Learn what a natural indicator is in chemistry. Discover how turmeric, litmus (lichen), and china rose change color in acids and bases.
Natural indicators are found in plants and change colour in acids and bases. Litmus, turmeric, and red cabbage are key examples. Learn with FAQs.
Nessler's reagent is K2[HgI4] dissolved in KOH. It detects ammonium ions (NH4+) — gives a brown precipitate with NH3. Learn its formula and reaction.
Learn why the bond angle of NH3 is 107 degrees. Understand VSEPR theory, sp3 hybridization, and lone pair repulsion in ammonia.
Learn the hybridization of the central nitrogen atom in Ammonia (NH3). Understand why its shape is trigonal pyramidal and not tetrahedral.
Learn how to calculate the oxidation number (state) of Nitrogen in the Ammonia (NH3) molecule using simple redox rules.
Learn the electron configuration of Nickel (Ni, Z=28). Understand the ground state configuration [Ar] 3d8 4s2 and its exceptions.
Understand the dsp2 hybridization of the tetracyanonickelate(II) ion. Learn about strong field ligands and square planar geometry.
Learn the hybridization of Ni(CO)4 — Nickel tetracarbonyl. Understand why it is sp3 hybridized, tetrahedral, and diamagnetic.
Learn how many valence electrons a Nitrogen atom has. Understand its atomic number, electron configuration, and bonding capacity.
Learn how to calculate the oxidation number (or oxidation state) of Nitrogen in NO2 (Nitrogen Dioxide). The correct answer is +4.
Normality definition in chemistry: gram equivalents of solute per litre of solution. Formula N = Molarity × n-factor. Examples with acid-base and redox reactions.
Nuclear charge = Z × e (protons × charge). Effective nuclear charge Zeff = Z − S. Learn shielding effect, Slater's rules, and periodic trends. Class 11 chemistry.
Number of neutrons in 1.7g of ammonia (NH₃) = 4.215 × 10²³. Calculation: 0.1 mol NH₃ × 6.022 × 10²² molecules × 7 neutrons per molecule. Step-by-step solution.
Number of protons in nickel is 28. Nickel (Ni) has atomic number 28, meaning every nickel atom contains exactly 28 protons in its nucleus.
Olfactory indicators change smell (not colour) in acid or base. Examples: onion, clove oil, vanilla. Used when colour change is hard to detect. NCERT Class 10 Chemistry.
One mole of methane (CH₄) = 16 g, 6.022×10²³ molecules, 4 moles of H atoms. At STP it occupies 22.4 L. Learn all mole calculations for CH₄ with FAQs.
Understand the key differences between the Order of a reaction (an experimental value) and Molecularity (a theoretical concept).
Learn Ostwald's Dilution Law for weak electrolytes. Understand the relationship between degree of dissociation, Ka, and concentration with derivation.
Learn the variable oxidation numbers of Chlorine (Cl). Understand why it ranges from -1 to +7 with examples like NaCl, HClO, HClO4.
Learn the oxidation number of the Cyanide ion (CN). Understand how to calculate the individual oxidation states of Carbon and Nitrogen in the CN- ion.
Learn the rules for assigning oxidation numbers in redox reactions. Find out the common oxidation states of Oxygen, Nitrogen, Sulphur, and Carbon.
Learn the oxidation state of carbon in CO (Carbon Monoxide). Understand how to calculate it using the standard oxidation state rules.
Learn the oxidation state of nitrogen in NO (Nitric Oxide). Step-by-step calculation with oxidation state rules.
Learn the hybridization of the central Phosphorus atom in PCl5 (Phosphorus Pentachloride). Understand its Trigonal Bipyramidal shape and equatorial/axial bonds.
Percent ionic character of TiO2 is approximately 59%. Calculated using Pauling's formula with electronegativity difference of 1.90. Step-by-step solution & FAQs.
Periodic table of first 20 elements from Hydrogen (H) to Calcium (Ca) with atomic number, symbol, atomic mass, electron configuration, valency, and properties.
Learn why permanent hardness of water cannot be removed by boiling. Understand the causes of permanent hardness and the methods used to remove it.
Learn the colour of phenolphthalein in acidic, basic, and neutral solutions. A crucial acid-base indicator for Class 10 and 12 Chemistry titrations.
Phitkari (alum) formula is KAl(SO4)2·12H2O. Molecular mass 474 g/mol. Used in water purification, shaving, and dyeing. Learn its structure and uses.
Plaster of Paris formula is CaSO4·½H2O (calcium sulphate hemihydrate). Made by heating gypsum at 120°C. Sets hard by reabsorbing water. Learn its chemistry.
जानें प्लास्टर ऑफ पेरिस (POP) का रासायनिक सूत्र, रासायनिक नाम और इसे कैसे बनाया जाता है। कक्षा 10 विज्ञान के लिए महत्वपूर्ण नोट्स।
Polonium is the only element that naturally crystallizes in a simple cubic structure. Coordination number 6, packing efficiency 52.4%. Class 12 solid state chemistry.
POP (Plaster of Paris) chemical formula is CaSO₄·½H₂O (calcium sulphate hemihydrate). Learn preparation, setting reaction, uses and properties for Class 10/11 Chemistry.
Potassium permanganate (KMnO₄) oxidizes ethanol to acetic acid (ethanoic acid). Learn the stepwise reaction, conditions, and mechanism for Class 10 and 12 Chemistry.
Pure water (H₂O) is composed of hydrogen (11.11%) and oxygen (88.89%) by mass, in a 2:1 atom ratio. Learn the composition, formula and verification with FAQs.
Halogens reactivity decreases from F to I: F > Cl > Br > I. Learn why reactivity decreases down Group 17 with displacement reactions and electron affinity data.
Barium sulphate (BaSO₄) is reduced by carbon (coke) at high temperature: BaSO₄ + 4C → BaS + 4CO. This produces barium sulphide (BaS) and carbon monoxide.
Learn the relation between Kp and Kc in Chemical Equilibrium. Understand the formula Kp = Kc(RT)^Δn, its derivation, and conditions when Kp equals Kc.
Find the exact chemical formula for Rust (Fe2O3.nH2O). Learn the Hindi meaning of rusting (Jung lagna) and how to prevent it using galvanization.
Learn the chemical equation for the rusting of iron. Understand the formula of rust (hydrated iron oxide), oxidation, and the conditions required.
Learn what salt means in chemistry. Understand the chemical formula of common salt (NaCl) and the 4 types of salts formed in acid-base reactions.
Saponification is the reaction of fat/oil (ester) with NaOH or KOH to form soap and glycerol. Learn the equation, mechanism, and types of soap with FAQs.
Learn the definition of a Saturated Solution in Chemistry. Understand saturation point, solubility, and the difference between unsaturated and supersaturated.
Learn the electron configuration of Scandium (Sc, Atomic Number 21). Understand its full spdf notation and noble gas core shorthand [Ar] 4s2 3d1.
Learn about Schottky Defect in Solid State Chemistry. Understand how equal numbers of cations and anions leave the crystal lattice and how it lowers density.
Learn the exact differences between a Sigma bond and a Pi bond. Understand axial vs lateral overlap, bond strength, and free rotation.
Understand the highly exothermic chemical reaction between Sodium and cold water. Also, learn the chemistry behind 'Sirka' (Vinegar / Acetic Acid).
Learn the atomic number, atomic mass, and electronic configuration of Sodium (Na). Understand why sodium is highly reactive and its important uses.
Learn the composition of the alloy Solder. Understand why Lead and Tin are mixed to create an alloy with a low melting point for welding electrical wires.
Learn the exact physical differences between Solid, Liquid, and Gas. Understand how the spacing and kinetic energy of atoms change across the three states of matter.
Solution solute and solvent explained — a solution is a homogeneous mixture, solute is the substance dissolved, solvent is what dissolves it. Examples & FAQs.
Sulphur (S) has atomic number 16. Electronic configuration: 2,8,6. Period 3, Group 16 (VIA). Yellow non-metal. Key properties for Class 9–11 Chemistry NCERT.
Learn what a suspension is in Chemistry. Understand its properties, the Tyndall effect, and see common everyday examples like muddy water and chalk water.
Synthetic indicators are artificially prepared acid-base indicators. The two main examples are phenolphthalein and methyl orange. Learn colour changes and FAQs.
Tartaric acid has a specific rotation of +12.0°. Learn about optical activity, stereoisomers of tartaric acid, specific rotation formula, and solved problems.
Learn the chemical formula and composition of Tear Gas. Understand what CS Gas is (C10H5ClN2) and how it causes intense irritation to the eyes and lungs.
Learn about tert-butyl alcohol (TBA). Understand its chemical formula, its IUPAC name (2-Methylpropan-2-ol), its structure, and its uses as a solvent.
Learn which metal is the most abundant in the Earth's crust. Discover why Aluminium is so common, followed by Iron, and why Oxygen is the most abundant element overall.
Learn about Tollens' Reagent (ammoniacal silver nitrate) used in Class 12 Organic Chemistry to distinguish aldehydes from ketones via the Silver Mirror Test.
Learn what transition elements are in Class 12 Chemistry. Understand their position in the periodic table, key properties, and important examples.
Learn the easiest mnemonic tricks to memorize the 3d, 4d, and 5d series of the d-Block (Transition elements) in the Periodic Table for Class 11 and 12 Chemistry.
When lead nitrate is heated: (1) yellow residue of lead monoxide (PbO) forms; (2) brown fumes of nitrogen dioxide (NO₂) released. Balanced equation. Class 10 Chemistry.
Two synthetic indicators used in Chemistry are Phenolphthalein and Methyl Orange. Learn their colour changes in acid and base with a comparison table. NCERT Class 10.
The Tyndall effect is the scattering of light by colloidal particles, making the beam of light visible. It distinguishes colloids from true solutions. Examples: fog, dusty rooms, forest sunlight.
Silicon (Z=14) has 2 unpaired electrons. Configuration [Ne] 3s² 3p². By Hund's rule: 3px¹ 3py¹ 3pz⁰ — two singly occupied p-orbitals. Fully explained.
Learn the molecular weight (molar mass) of Urea (NH2CONH2). Get a step-by-step calculation using the atomic weights of Nitrogen, Hydrogen, Carbon, and Oxygen.
Learn the chemical formula of washing soda (Na₂CO₃·10H₂O) and its many uses in Class 10 Chemistry — from laundry to glass manufacturing.
Learn how many valence electrons the Cl⁻ (chloride ion) has. Understand how gaining an electron changes the electron configuration.
Learn about the valency of Barium (Ba). Understand why Barium exhibits a valency of +2, its electron configuration, and common Barium compounds.
Learn the valency and chemical formula of the Carbonate ion. Understand why it has a valency of 2 and how to write formulas for Sodium and Calcium Carbonate.
Learn the valency of the most important ions in Class 9-10 Chemistry: Sodium (+1), Calcium (+2), Ammonium (+1), Nitrate (-1), and Sulphate (-2).
Discover the valency of Fluorine in Calcium Fluoride (CaF2). Learn how ionic bonds form between Calcium and Fluorine to create stable compounds.
Learn the valency of Iodine. Discover why it has a primary valency of 1, its electronic configuration, and why it can also show variable valencies like 3, 5, and 7.
Iron exhibits variable valency. Learn about the most common valencies of Iron: +2 (Ferrous) and +3 (Ferric), their electron configurations, and examples.
Learn the valency of Potassium (1), Lead (2 or 4), and Bromide (1). Understand the concept of variable valency in chemistry with a clear table.
Learn the valency of Magnesium (Mg). Understand its atomic number, electronic configuration (2,8,2), and why it loses 2 electrons to form the Mg2+ ion.
Learn to define valency. Understand how to determine the combining capacity of an element using the examples of Silicon (valency 4) and Oxygen (valency 2).
Learn about the valency of Silver (Ag). Discover why silver commonly exhibits a valency of +1, its electron configuration, and its rare +2 state.
Learn the definition and formula of vapour density in Class 11 Chemistry. Understand how vapour density relates to the molar mass of a gas.
विरंजक चूर्ण (Bleaching Powder) का रासायनिक सूत्र (CaOCl2) जानें। Class 10 Chemistry के लिए इसका रासायनिक नाम (Calcium Oxychloride) और उपयोग समझें।
When water is poured on calcium oxide, slaked lime forms in an exothermic reaction. Equation: CaO + H₂O → Ca(OH)₂. Observations, uses, and FAQs explained.
Learn the difference between strong/weak acids and strong/weak bases in Class 10-11 Chemistry. Includes examples and pH comparison.
Weak acids partially dissociate in water. Examples include acetic acid, carbonic acid, and citric acid. Learn the difference between weak and strong acids with FAQs.
Acetylene (ethyne, C₂H₂) is the main welding fuel gas used in oxyacetylene welding. Learn the chemistry, flame temperature, and other welding gases with FAQs.
Learn what Halogens are in Chemistry. Discover the Group 17 elements (Fluorine, Chlorine, Bromine, Iodine) and why they are called salt formers.
Learn the exact definition of Isobars in chemistry. Understand how isobars differ from isotopes with clear examples like Calcium-40 and Argon-40.
Learn the 3 major limitations of Dmitri Mendeleev's periodic table. Understand why the position of Hydrogen, Isotopes, and Cobalt-Nickel caused it to fail.
Zinc nitrate decomposes when strongly heated: 2Zn(NO₃)₂ → 2ZnO + 4NO₂ + O₂. White ZnO, brown NO₂ fumes, and oxygen gas are produced. Learn with FAQs.
Electronic configuration reveals an atom's group, period, valency, chemical nature, and bonding behaviour. Learn all the information it provides with examples and FAQs.
A covalent compound is formed when non-metal atoms share electrons. Examples: H₂O, CO₂, CH₄, NH₃. Properties, types (polar/non-polar) and FAQs explained.
Learn what a fuel cell is, how it works, and its advantages over conventional batteries. Understand the hydrogen-oxygen fuel cell used in spacecraft.
Learn what a Ligand is in Chemistry. Class 12 guide on Coordination Compounds, types of ligands (unidentate, bidentate, polydentate) and electron donors.
Learn what an indicator is in chemistry. Discover natural, synthetic, and olfactory indicators used to test whether a substance is an acid or a base.
Learn what chain isomerism is in organic chemistry. Understand structural isomers with clear examples like Pentane, Isopentane, and Neopentane.
Learn what a Double Displacement reaction is in Chemistry. Understand the mutual exchange of ions, precipitation reactions, and examples for Class 10 Science.
Learn what Eau de Cologne is. Understand the chemical composition of perfumes, the concentration of essential oils in alcohol, and why it fades quickly.
Learn what Hydrogenation is in Carbon and its Compounds. Understand the industrial addition reaction of adding hydrogen to vegetable oil to make Vanaspati Ghee.
Understand the definition of Ionization Enthalpy (Ionization Energy) in chemistry. Learn how it changes across periods and groups in the periodic table.
Learn what an Isotonic Solution is. Understand the science of osmosis, solute concentration, and why hospitals use isotonic saline IV drips for patients.
Understand Lanthanide Contraction in f-block elements. Learn about poor shielding of 4f electrons and its consequences on the atomic radii of transition metals.
Learn what is meant by a substance in Chemistry. Class 9 Science definition of pure substances, elements, compounds, and the difference from mixtures.
Learn what Osmotic pressure is in Chemistry. Understand osmosis, the semipermeable membrane, and the formula (Pi = CRT) for calculating osmotic pressure.
Learn the exact definition of pasteurisation, how it works, and why it is used to make milk and juice safe to drink without destroying nutrients.
Learn what a Precipitation reaction is in Chemistry. Discover how two clear liquids form an insoluble solid precipitate, with examples for Class 10 Science.
Learn the definition of rancidity in chemistry. Understand the two main methods to prevent rancidity in fats and oils — antioxidants and nitrogen flushing.
Learn the difference between solute and solvent in Chemistry. Understand how solutions are formed with clear examples like salt in water for Class 9 Science.
Find out what turns red litmus paper blue in chemistry. Learn about basic (alkaline) solutions, litmus tests, and common household bases.
Learn the exact condition for a spontaneous reaction. Understand why a chemical reaction is spontaneous only when Gibbs Free Energy (Delta G) is negative.
Learn which acid is naturally present in tomatoes. Discover oxalic acid and citric acid in tomatoes, why tomatoes taste sour, and their effect on health.
Find out which primary acid is present in tomatoes. Learn about Citric acid, Malic acid, and Oxalic acid found in this common vegetable/fruit.
Learn which gases cannot be collected by the water displacement method in Chemistry lab. Understand why soluble gases like HCl, SO2, NH3 dissolve in water.
Mercury (Hg) is the only metal that is liquid at room temperature (melting point −38.83°C). Gallium melts at 29.76°C. Learn why mercury is liquid with FAQs.
Learn which substances have the greatest molecular mass in chemistry. Understand why proteins and polymers have enormous molar masses compared to simple compounds.
Gold and platinum are used for jewellery because they are unreactive, lustrous, malleable, and ductile. Learn all the chemical and physical reasons with FAQs.
Inert gases are placed in Group Zero (Group 18) because they have zero valency due to completely filled electron shells. Learn the reason with elements and FAQs.
A metal cannot displace itself from its own salt solution because displacement requires a more reactive metal. Learn the activity series rule with examples and FAQs.
An atom is electrically neutral because the number of protons (positive) equals the number of electrons (negative), making the net charge zero. Learn with FAQs.
Why is potassium nitrate classified as an electrolyte? KNO₃ dissociates completely into K⁺ and NO₃⁻ ions in water, conducting electricity. Strong electrolyte explained.
Sodium hydrogen carbonate (NaHCO₃) is a basic salt because it gives an alkaline solution in water. HCO₃⁻ hydrolyses to form OH⁻. Learn the reason with FAQs.
Learn why sodium metal is kept immersed in kerosene oil. Class 10 Chemistry guide on sodium's extreme reactivity with air and water, and how kerosene protects it.
Learn why iodised salt is advisable. Understand how iodine deficiency causes goitre, how iodised salt prevents it, and why the government mandates its use.
Water is liquid at room temperature due to extensive hydrogen bonding between H₂O molecules. This raises its boiling point to 100°C, far above comparable molecules like H₂S (−60°C).
Learn the Wurtz-Fittig reaction in Class 12 Organic Chemistry. Understand how aryl halides react with alkyl halides and sodium metal to form alkylarenes.