Which of the following is the most suitable drying agent for ammonia gas?

Calcium oxide

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Anhydrous calcium chloride

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Phosphorus pentaoxide

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Conc. sulphuric acid

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Solution

The correct option is A Calcium oxide
Moist $N H_{3}$ is dried over quick lime $(C a O) .$ lt cannot be dried over conc. $H_{2} S O_{4}$ or $P_{2} O_{5}$ because being basic it forms salts with them. Anhydrous $C a C l_{2}$ also cannot be used because it forms a complex $C a C l_{2} \cdot 8 N H_{3}$ with ammonia.

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