JEE CHEMISTRY MCQ: STATES OF MATTER

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Assertion: The pressure of a gas is directly proportional to the density of gas at a constant temperature and molecular mass.

Reason: The molecular weight of a vapour of a substance can be calculated using the expression

M=\frac{d R T}{P}

, where

M

is the molecular weight of the vapour,

d

is its density and

P

is the pressure of the vapour,

{R}

is the gas constant and

{T}

is the temperature.

View answer and explanation

Correct option: A

Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Option A is correct. The ideal gas law can be rearranged to show that pressure is directly proportional to density at constant temperature and molecular mass. The reason provides the correct formula derived from the ideal gas law.

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a. Particles of a gas move in all possible directions in straight lines.
b. At any particular time, different particles in the gas have different kinetic energies.
c. Collisions of gas molecules are perfectly inelastic in nature.
The correct statement(s) is/are The compressibility factor of an ideal gas is The relative strength of interionic/intermolecular forces in decreasing order is Compressibility factor of an ideal gas is