4(i)
State a relevant reason for the following:
(a) Hydrogen chloride gas cannot be dried over quick lime.
(b) Ammonia gas is not collected over water.
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(a) Quicklime [CaO] is alkaline in nature and it reacts with HCl forming the respective chloride. Hence, it can't be used as a drying agent for Hydrogen chloride gas.
CaO + 2HCl ⟶ CaCl2 + H2O
(b) As ammonia gas is highly soluble in water, therefore, it is not collected over water.