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Q.

At 298 K and 1 atm pressure, a gas mixture contains equal masses of He, H2, O2 and NH3 . Which of the following is correct for their average molecular velocities?

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a

He>H2>NH3>O2

b

H2<He<NH3<O2

c

He<H2<O2<NH3

d

O2<NH3<He<H2

answer is D.

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Detailed Solution

The average velocity inversely proportional to molecular mass so, average velocity order is O2<NH3<He<H2 .
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