Statement I: At constant temperature, if pressure on the fixed mass of a gas is doubled, its density is doubled. Statement II: At constant temperature, molecular mass of a gas is directly ∝ the densit

Question

Statement I: At constant temperature, if pressure on the fixed mass of a gas is doubled, its density is doubled. Statement II: At constant temperature, molecular mass of a gas is directly ∝ the density and inversely ∝ pressure.

Prashant Kotian · Accepted Answer

Correct answer: C. Density of a gas is d = PM/RT. At constant T, density d is directly ∝ pressure P, so doubling pressure doubles density (Statement I is correct). Statement II claims molecular mass is inversely ∝ pressure, which is false since molecular mass is a constant property of the gas substance.

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