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

Calcium oxide

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Anhydrous calcium chloride

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Phosphorus pentoxide

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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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Phosphorous pentoxide and concentrated sulphuric acid can be classified as basic drying agents.

Calcium oxide and phosphorus pentoxide are very good drying agents but they are not used to dry HCl gas. Give reasons for each.

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