Assertion : Effusion rate of oxygen is smaller than nitrogen.
Reason : Molecular size of nitrogen is smaller than oxygen.

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If both assertion and reason are true and the reason is the correct explanation of the assertion

If both assertion and reason are true but reason is not the correct explanation of the assertion.

If assertion is true but reason is false.

If the assertion and reason both are false.

answer is C.

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Detailed Solution

Assertion is true but reason is false because of effusion rate $\propto \frac{1}{\sqrt{M}}$ (Molecular weight) but it does not depend on molecular size.

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