Chemical Changes and Reactions — Question 1

(a) Metal hydroxide on heating forms metal oxide and water vapour — Calcium hydroxide

Ca(OH)₂ $\xrightarrow{\Delta}$ CaO + H₂O

(b) Metal hydroxide on heating forms metal, oxygen and water vapours — silver hydroxide

4AgOH $\xrightarrow{\Delta}$ 4Ag + O₂ + 2H₂O

(c) Metal nitrate decomposes to give two products only — potassium nitrate

2KNO₃ $\xrightarrow{\Delta}$ 2KNO₂ + O₂ ↑

(d) Metal nitrate on heating forms metal oxide, nitrogen dioxide and oxygen — Lead nitrate

2Pb(NO₃)₂ $\xrightarrow{\Delta}$ 2PbO + 4NO₂ + O₂ ↑

(e) Metal nitrate on heating forms metal, nitrogen dioxide and oxygen — Silver nitrate

2AgNO₃ $\xrightarrow{\Delta}$ 2Ag + 2NO₂ + O₂ ↑

(f) Metal carbonate which is stable to heat — Potassium carbonate

Potassium carbonate is stable to heat

(g) Metal carbonate which forms metal oxide and carbon dioxide on heating — Magnesium carbonate

MgCO₃ $\xrightarrow{\Delta}$ MgO + CO₂ ↑

(h) The heating effect on bivalent metal hydrogen carbonate — Magnesium bicarbonate

Mg(HCO₃)₂ $\xrightarrow{\Delta}$ MgCO₃ + H₂O + CO₂ ↑