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JEE Main levelSingle correct optionDifficulty 2 of 3ig023

The vapour density of a gas is 24. Its molar mass is

A $24 g mo l^{- 1}$
B $12 g mo l^{- 1}$
C $48 g mo l^{- 1}$
D $96 g mo l^{- 1}$

Answer: C

Vapour density is the density of the gas relative to hydrogen at the same

T

and

P

, and equals

M /2

since the molar mass of

H X_{2}

is 2. So

M = 2 \times 24 = 48 g mo l^{- 1}

.

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