K, Na, Ca, Mg, Al, Zn, Fe, Pb, Cu, H, Hg, Ag

Pick an element from the reactivity series given above and write the equations for the the following:

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

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

(c) Metal nitrate decomposes to give two products only.

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

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

(f) Metal carbonate which is stable to heat.

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

(h) The heating effect on bivalent metal hydrogen carbonate.

(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 ↑