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.
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