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JEE Main 2025 (7 Apr, Shift 2) · Gas Laws & Ideal Gas Equation

Gas Laws & Ideal Gas Equation question from JEE Main 2025 (7 Apr, Shift 2)

Q21JEE Main 2025 · 7 APR · SHIFT 2Easy

Gas Laws & Ideal Gas Equation

The helium and argon are put in the flask at the same room temperature (300 K). The ratio of average kinetic energies (per molecule) of helium and argon is:

(Give: Molar mass of helium = 4 g/mol, Molar mass of argon = 40 g/mol)

Show answer and solution

Answer: (d)

Average translational KE per molecule $= \dfrac{3}{2}k_BT$ , independent of molar mass.
Both gases are at 300 K, so the KEs are equal.
So the answer is (d) 1 : 1.

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