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Q.

Mean free path of a gas molecule is

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a

Inversely proportional to number of molecules per unit volume

b

Directly proportional to the square root of the absolute temperature 

c

Directly proportional to the molecular mass

d

Inversely proportional to diameter of the molecule

answer is A.

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Detailed Solution

Mean free path, λ=12πd2n

where, n = number of molecules per unit volume,

 d = diameter of the molecules

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