Assertion :The average speed of gas molecules decreases with the increase in molar mass of gas at constant temperature. Reason: The average kinetic energy per mole of all the gases is same, independent of their molar masses.

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
Average speed of gas molecule is given by formula,
$v_{A v} = \sqrt{\frac{8 R T}{π M}}$

So, $V_{A v} \propto \frac{1}{\sqrt{M}}$

So, increase in molar mass, decrease in the average speed.

And average kinetic energy is defined as,

$k = \frac{3 R}{2 N_{A}} \times T$

So, it depend on temperature but not on the molar mass. So, reason correct.

Option A Correct.

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