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Question

For ideal gas molecules the following quantities have zero average values.

A
Velocity
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B
Momentum
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C
Kinetic energy
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D
Density
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Solution

The correct option is B Momentum
If in an ideal gas sample you find one molecule with a particular velocity at any instant then because of large and random velocity distribution you can also find another molecule with exactly opposite velocity.
vav=0pav=0K.E.=f2nRTρ=PMRTSince,PV=nRTPV=mMRTPM=mVRT

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