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Question

Assertion :Mean free path of a gas molecules varies inversely as density of the gas. Reason: Mean free path varies inversely as pressure of the gas.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The distance travelled by a gas molecule between two successive collisions is known as free path
i.e λ=12kTπd2P
where d= Diameter of the molecule
k=Boltzmann constant
P= Pressure and
T= Tmeperature of as molecules
From the above equation, we can see that λ varies inversely as the pressure of the gas
Also λ=m2πd2ρ i.e λ1ρ
where m= mass of each molecules
ρ= density of gas molecule

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