To dry ammonia gas the drying agent used is :

C o n . H_{2} S O_{4}

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P_{2} O_{5}

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soda lime

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anhydrous

C a C l_{2}

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Solution

The correct option is A $C o n . H_{2} S O_{4}$
$N H_{3}$ reacts with the usual drying agent i.e. conc. $H_{2} S O_{4}$ to form a salt.

$2 N H_{3} (g) + H_{2} S O_{4} (l) \to {(N H_{4})}_{2} S O_{4} (s)$

Hence the correct option is A.

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