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JEE Main levelSingle correct optionDifficulty 2 of 3ig186

Which of the following gases has the lowest density at the same temperature and pressure?

A $NH X_{3}$ (17)
B $CH X_{4}$ (16)
C $H X_{2} O$ vapour (18)
D $Ne$ (20)

Answer: B

d \propto M

at fixed

T

and

P

.

CH X_{4}

has the smallest molar mass (16), hence the lowest density.

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