Assertion :At constant temperature, if pressure on the gas is doubled, density is also doubled. Reason: At constant temperature, molecular mass of a gas is directly proportional to the density and inversely proportional to the 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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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
As we know,
$P V = n R T$
$P = d R T / M$
so at constant temperature, if pressure on the gas is doubled, density is also doubled.
and
Molecular mass does not depends upon $T$ , and $P$ .

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