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NEET levelSingle correct optionDifficulty 1 of 3ig011

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

A $CO X_{2}$
B $N X_{2}$
C $CH X_{4}$
D $O X_{2}$

Answer: A

At the same

T

and

P

,

d = PM / RT

is proportional to molar mass. Molar masses are

CO X_{2}

44,

O X_{2}

32,

N X_{2}

28,

CH X_{4}

16, so

CO X_{2}

is densest.

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