The drying agents like P 2 O 5 and CaO cannot be used to dry hydrogen chloride gas because-A- P 2 O 5 is volatileB- CaO is not a drying agentC- Both P 2 O 5 and CaO react with hydrogen chlorideD- P 2 O 5 is not a drying agent

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Laboratory Preparation of Ammonia

The drying ag...

Question

The drying agents like $P_{2} O_{5}$ and CaO cannot be used to dry hydrogen chloride gas because:

P₂O₅ is volatile

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CaO is not a drying agent

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Both P₂O₅ and CaO react with hydrogen chloride

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P₂O₅ is not a drying agent

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Solution

The correct option is C
Both P₂O₅ and CaO react with hydrogen chloride

Hydrogen chloride gas is dried by passing through conc. sulphuric acid. The other drying agents like phosphorous pentaoxide and quick lime cannot be used since they react with hydrogen chloride.

$2 P_{2} O_{5} + 3 H C l \to P O C l_{3} + 3 H P O_{3} C a O + 2 H C l \to C a C l_{2} + H_{2} O$

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