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JEE Main levelSingle correct optionDifficulty 2 of 3ig187

The density of a gas is $1.78 g L^{- 1}$ at STP (molar volume $22.4 L$ ). The gas could be

A $Ar$ (40)
B $N X_{2}$ (28)
C $CO X_{2}$ (44)
D $Cl X_{2}$ (71)

Answer: A

M = 1.78 \times 22.4 = 39.9 g mo l^{- 1}

, matching

Ar

(40).

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