Give balanced equations for the decomposition of

1. calcium bicarbonate by dil. HCl
2. calcium carbonate by dil. HNO₃
3. sodium sulphite by dil. H₂SO₄
4. zinc sulphide by dil. H₂SO₄.

Starting from insoluble ZnO how would you obtain insoluble ZnCO₃ by precipitation.

State what will be the effect of each of the following solution on blue litmus —

(i) K₂CO₃ soln.

(ii) KCl soln.

(iii) NH₄NO₃ soln.

Give balanced equations for the preparation of the following salts –

(a) (i) CuSO₄

(ii) NaHSO₄

(iii) Na₂SO₄

(iv) FeSO₄

(v) BaSO₄

(vi) PbSO₄ — using dil. H₂SO₄

(b) (i) NaHSO₄

(ii) CuSO₄ — using conc. H₂SO₄