Assertion :The downward displacement of air method used for drying and collecting ammonia gas. Reason: Ammonia gas is lighter than air and hence collected by the downward displacement of air. Ammonia is not collected over water since it is highly soluble in water.(1 vol.of water dissolves about 702 vol.at 20C and 1 atm pressure). The drying agent used is calcium oxide.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Ammonia gas is lighter than air and hence collected by the downward displacement of air [V.D. of ammonia=8.5,V.D. of air=14.4]. Ammonia is not collected over water since it is highly soluble in water.(1 vol.of water dissolves about 702 vol. at $20^{0} C$ and 1 atm pressure). The drying agent used is calcium oxide.

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Similar questions

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Assertion (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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