Assertion :In the Fountain Experiment the gas used is hydrogen chloride or ammonia. Reason: Ammonia has very pungent irritating smell which is highly distinct and can be distinguished from choking smell of hydrochloric acid.

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
1) Ammonia has very pungent irritating smell which is highly distinct and can be distinguished from choking smell of hydrochloric acid.
2) Identification can be done by bringing a rod dipped in ammonium hydroxide near the flask filled of gas. White fumes of ammonium chloride is formed which shows it is HCl and not ammonia gas.
$H C l + {N H}_{4} O H \to {N H}_{4} C l + H_{2} O$

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