Statement 1: At constant temperature, if pressure on the fixed mass of a gas is doubled, its density is doubled.
Statement 2: At constant temperature, molecular mass of a gas is directly proportional to the density and inversely proportional to pressure.

Question

Statement 1: At constant temperature, if pressure on the fixed mass of a gas is doubled, its density is doubled.

Statement 2: At constant temperature, molecular mass of a gas is directly proportional to the density and inversely proportional to pressure.

TestHub · Accepted Answer

From d = PM/RT, at constant T, d ∝ P for a fixed gas, so doubling P doubles d — Statement 1 is correct. Statement 2 is incorrect: molecular mass is a fixed characteristic constant of a gas and does not vary with density or pressure. M = dRT/P is only a formula for determining M from a measurement; if M truly varied as d/P, then a gas whose P and d both double would have M simultaneously double and halve, which is absurd. I correct, II incorrect. Ans: (c).

Chemistry - Ideal Gas Question with Solution | TestHub

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