Convert (i) NaHCO₃ (ii) Na₂CO₃ to unstable carbonic acid by action with dil. H₂SO₄.
State the reason why ammonia is evolved when an ammonium salt and alkali are heated.

State in the above reactions a reason for the formation of the respective acids from conc. H₂SO₄.

State how you would obtain:

1. Sulphuric acid from an acidic oxide
2. KOH from a basic oxide.

State two chemical properties each with equations of a solution containing

(i) H⁺ ions

(ii) OH^- ions