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Question

The drying agents like P2O5 and CaO cannot be used to dry hydrogen chloride gas because:


A

P2O5 is volatile

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B

CaO is not a drying agent

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C

Both P2O5 and CaO react with hydrogen chloride

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D

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.

2P2O5+3HClPOCl3+3HPO3CaO+2HClCaCl2+H2O


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