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JEE Main levelSingle correct optionDifficulty 2 of 3rg080

Which gas has the lowest inversion temperature among the following?

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

Answer: C

The inversion temperature

T_{i} = 2 a / R b

is proportional to the strength of attraction. Helium has the smallest

a

, so its inversion temperature is lowest (about

40 K

); nitrogen and oxygen have

T_{i}

above

600 K

and

CO X_{2}

about

1500 K

.

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