Select the correct word/formula from the choices given below:
$P t, N H_{4} O H, C a C l_{2}, N_{2}, C a O, A l N, K_{2} H g I_{4}, F e, N C l_{3}, u r e a$
A substance which is not used as a drying agent for ammonia.

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Solution

Ammonia is a basic compound.
It can be dried by using a basic compound so that the agent does not react with ammonia.
Most often calcium oxide $CaO$ is used as the drying agent for ammonia preparation.
Thus, ${CaCl}_{2}$ is a substance which is not used as a drying agent for ammonia, as calcium chloride reacts with ammonia.

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