1(iv)
The drying agent used to dry HCl gas is:
- (a)Conc. H2SO4
- (b)ZnO
- (c)Al2O3
- (d)CaO
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Conc. H2SO4
Reason — Drying agent used for drying should only remove the moisture and not react with it, hence, conc. sulphuric acid is used as the drying agent.