In Class 10 Chemistry, thermal decomposition reactions are very important. Two of the most frequently tested experiments involve heating Ferrous Sulphate (FeSO₄) and Lead Nitrate (Pb(NO₃)₂). Remembering their colours is crucial for exam questions.
Ferrous Sulphate initial: Pale Green.
Ferrous Sulphate after heating: Reddish-Brown residue + burning sulphur smell.
Lead Nitrate initial: White powder.
Lead Nitrate after heating: Yellow residue + Brown fumes of NO₂ gas.
What happens on heating?
What happens on heating?
Ferrous sulphate crystals (FeSO₄·7H₂O) are pale green in colour.
Lead nitrate is a white or colourless powder.
Nitrogen dioxide (NO₂) gas produces the brown fumes when lead nitrate is heated.
Difference Between Metals and Nonmetals
Learn the key differences between metals and non-metals. Compare their physical properties (malleability, conductivity) and chemical properties for Class 10.
Why is the Dipole Moment of NF3 Less Than NH3?
Learn the structural and chemical reason why the dipole moment of NF3 is lower than NH3 despite Fluorine being more electronegative than Nitrogen.
What are Dobereiner's Triads in Chemistry?
Learn about Dobereiner's Triads in chemistry. Understand the first historical attempt to organize chemical elements based on their atomic mass and properties.
Does Nitric Acid Turn Red Litmus Blue? The Correct Answer
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.
Define Double Displacement Reaction
What is a double displacement reaction? Learn the definition with examples, such as the reaction between barium chloride and sodium sulphate.
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