Which gas will diffuse fastest?

Practice MCQ for SSC, UPSC, RRB Exams

A. CO₂ A.
B. O₂ B.
C. CH₄ C.
D. Cl₂ D.

Correct Answer: C সঠিক উত্তর: C

Explanation ব্যাখ্যা

According to Graham's Law of Diffusion, the rate of diffusion of a gas is inversely proportional to the square root of its molecular mass. This means that lighter gases diffuse faster than heavier gases.

Molecular mass of O₂: 32 g/mol
Molecular mass of CO₂: 44 g/mol
Molecular mass of CH₄: 16 g/mol
Molecular mass of Cl₂: 70.9 g/mol

Since CH₄ has the lowest molar mass among the given options, it will diffuse the fastest.

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