Fill in the blank with the correct choice given in the bracket - Dry hydrogen chloride gas can be collected by …………… displacement of air. [downward/upward]

For the preparation of hydrochloric acid in the laboratory —

(i) State why direct absorption of hydrogen chloride gas in water is not feasible.

(ii) State what arrangement is used to dissolve hydrogen chloride gas in water.

Choose the correct answer from the options A, B, C and D given :

The drying agent used to dry HCl gas is :

A : Conc. H₂SO₄
B : ZnO
C : Al₂O₃
D : CaO

Name the acid used for the preparation of - hydrogen chloride gas in the laboratory. State why this particular acid is preferred to other acids.