A flask contains argon and oxygen in the ratio of 3: 2 in mass and the mixture is kept at 27 ° C. The ratio of their average kinetic energy per molecule respectively will be: (a) 3: 2 (b) 9: 4 (c) 2: 3 (d) 1: 1

Answer: (d). Average KE per molecule = 3/2kBT depends only on T. Both gases are at 27° C, so the ratio is 1:1; the mass ratio 3:2 does not matter. So the answer is (d) 1:1.

A flask contains argon and oxygen in the ratio of 3: 2 in mass and… | JEE Main 2022 (26 Jun, Shift 2)

Q27JEE Main 2022 · 26 JUN · SHIFT 2Easy

Pressure & Kinetic Energy of a Gas

A flask contains argon and oxygen in the ratio of 3: 2 in mass and the mixture is kept at 27 ${}^\circ$ C. The ratio of their average kinetic energy per molecule respectively will be:

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Answer: (d)

Average KE per molecule $= \frac{3}{2}k_BT$ depends only on $T$ .
Both gases are at $27^\circ$ C, so the ratio is $1:1$ ; the mass ratio $3:2$ does not matter.
So the answer is (d) $1:1$ .

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