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JEE Main levelSingle correct optionDifficulty 2 of 3sb093

Which of the following gases cannot be dried over anhydrous calcium chloride?

A $N X_{2}$
B $CO X_{2}$
C $H X_{2}$
D $NH X_{3}$

Answer: D

Anhydrous

CaCl X_{2}

combines with ammonia to form the addition compound

CaCl X_{2} \cdot 8 NH X_{3}

(and with alcohols), so ammonia cannot be dried over it. Nitrogen, carbon dioxide and hydrogen do not react.

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