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JEE Main levelOne or more correct optionsDifficulty 2 of 3ig142

Which of the following are correct for a gas at STP (molar volume $22.4 L$ )?

ADensity of $N X_{2}$ (28) is $1.25 g L^{- 1}$
BDensity of $H X_{2}$ (2) is about $0.089 g L^{- 1}$
CThe density of a gas at STP is numerically equal to its vapour density
DA gas with density $1.43 g L^{- 1}$ at STP has molar mass near 32

Answer: A, B, D

d = M /22.4

:

28/22.4 = 1.25

(A);

2/22.4 = 0.089

(B);

1.43 \times 22.4 = 32.0 \approx 32

(D). Vapour density is

M /2

, which is not numerically equal to

M /22.4

(C wrong).

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