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]

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.

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.