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NEET levelSingle correct optionDifficulty 1 of 3pn020

Which of the following can be used to dry ammonia gas?

Aconcentrated $H X_{2} SO X_{4}$
Banhydrous $CaCl X_{2}$
Cphosphorus pentoxide, $P X_{4} O X_{10}$
Dquicklime, $CaO$

Answer: D

Ammonia is basic, so it reacts with acidic drying agents (

H X_{2} SO X_{4}

,

P X_{4} O X_{10}

) and forms an addition compound with

CaCl X_{2}

(

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

). Basic quicklime does not react with it and is used.

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