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Question

Which of the following is the most suitable drying agent for ammonia gas?

A
Calcium oxide
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B
Anhydrous calcium chloride
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C
Phosphorus pentoxide
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D
Conc. sulphuric acid
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Solution

The correct option is B Calcium oxide
For drying Ammonia gas (basic in nature), we need a basic substance because if it is a acidic substance, Ammonia will react with it and form a salt.
So, only CaO can be used for drying Ammonia because it is the only basic compound among the given options.

Hence, Option "A" is the correct answer.

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