Assertion :Ammonia gas collected over water by the downward displacement of air. Reason: Ammonia is not collected over water since it is highly soluble in water.

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 B Both Assertion and Reason are correct but Reason is not 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 20C and 1 atm pressure). The drying agent used is calcium oxide.

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