NTSE Stage 2 SAT 2018 Exam Question Paper

Question : 16 of 100

Marks: +1, -0

At 298 K and 1 atm pressure a gas mixture contains equal masses of

He,H_2,O_2

and

NH_3

. Which of the following is correct for their average molecular velocities?

Solution:

\text "Average molecular velocities"∝\;\;{1}/{√{\;\text"Molecular mass"\;}}

Increasing order of molecular mass

{H}_{2} < {He} < {NH}_{3} < {O}_{2}

Thus the correct order is:

O_2 < NH_3 < He < H_2

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