In the laboratory preparation of HCl from sodium chloride, state why the following are preferred –

(i) Conc. H₂SO₄ as a reactant

(ii) Temp. below 200°C

(iii) Conc. H₂SO₄ as a drying agent.

State with reasons the method of collection of HCl gas in the laboratory.

State why HCl gas forms a mist of droplets of HCl acid in moist air.

State what the fountain experiment demonstrates with reference to HCl gas.