Assertion :The mass of a given volume of gas is compared to the mass of an equal volume of $H_{2}$ . Reason: Vapour density is the ratio of the mass of a volume of a gas to the mass of an equal volume of hydrogen measured under the same conditions of temperature and pressure.

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
Vapour density is the ratio of the mass of a volume of a gas, to the mass of an equal volume of hydrogen, measured under the same conditions of temperature and pressure.

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