What happens when: (i) Lead nitrate is heated. and (ii) Crystals of FeSO4 are heated.

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Solution

Dear Student

(i) Lead nitrate on heating decomposes into lead monoxide (PbO), nitrogen dioxide (NO₂) is liberated, along with oxygen, as a reddish brown gas.
Pb(NO₃)₂ + heat → 2PbO + 4NO₂ + O₂

(ii) On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO₄) is formed. So the colour of the crystals change. On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃).
FeSO₄.7H₂O + heat → FeSO₄ + 7 H₂O
2 FeSO₄ + heat → Fe₂O₃ + SO₂ + SO₃

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