Assertion :At low temperature (say $0^{o} C$ ) the effect of attractive forces dominates for $C O_{2}, C H_{4}$ and $N_{2}$ , whereas the molecular size effect dominates for $H_{2}$ and He to explain deviations. Reason: $Z > 1$ for $H_{2}$ and He, whereas Z < 1 for $C O_{2}, C H_{4}$ and $N_{2}$ .

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Due to smaller size of $H_{2}$ and He, repulsive forces dominant and Z>1.
while for other gases as attractive forces are dominant so Z<1

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