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Q.

The average translational kinetic energy of $O_{2}$ , molecules (relative molar mass $32$ ) at a particular temperature is $0.048 e V$ . The translational kinetic energy of $N_{2}$ , molecules (relative molar mass $28$ ) in $e V$ at the same temperature is

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a

$0.003$

b

$0.768$

c

$0.048$

d

$0.0015$

answer is C.

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Detailed Solution

Average translational $K E$ of a molecule $= \frac{3}{2} k_{B} T$

It depends on temperature and not on molecular mass. Hence average translational $K E$ for $N_{2}$ , will also be $0.048 e V$ .

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