Assertion :A lighter gas diffuses more rapidly than a heavier gas. Reason: At a given temperature, the rate of diffusion of a gas is inversely proportional to the square root of its density.

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
Rate of diffusion of gases is inversely proportional to square root of molecular mass of gases as well as their densities.

$R a t e \propto \sqrt{\frac{1}{M}} \propto \sqrt{\frac{1}{d}}$ .

Thus, a lighter gas will diffuse more rapidly than a heavier gas because of this. Hence, the correct answer is A.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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