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JEE Main levelSingle correct optionDifficulty 2 of 3rg058

At $300 K$ and $50 atm$ , which of the following gases is expected to have the compressibility factor closest to 1?

A $SO X_{2}$
B $NH X_{3}$
C $He$
D $Cl X_{2}$

Answer: C

Helium is a small, non-polar, monoatomic gas with the weakest intermolecular attraction and a very low boiling point (

4 K

). Its constants

a

and

b

are the smallest, so it stays closest to

P V = n RT

.

SO X_{2}

,

NH X_{3}

and

Cl X_{2}

are polar or heavy and deviate much more.

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