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NH3 gas is dried over...

`NH_3` gas is dried over

A

`CaO`

B

`HNO_(3)`

C

`P_(2)O_(5)`

D

`CuSO_(4)`

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The correct Answer is:
A
`HNO_(2)" and "CuSO_(4)` are not drying agents, while `P_(2)O_(5)` (a drying agent) reacts with `NH_(3)`. The moisture present in `NH_(3)` is removed by passing it through a tower packed with quick lime `(CaO)`.
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