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Relating Translational KE and T

Which one of ...

Question

Which one of the following gases behaves like an ideal gas ?

A

C O_{2}

at normal room temperature and pressure

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B

O_{2}

at

250^{\circ}

C and 5 atm pressure

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C

H_{2}

at

250^{\circ}

C and 5 mm of Hg pressure

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D

H e

at

273^{\circ}

C and 5 mm of Hg pressure

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Solution

The correct option is D $H e$ at $273^{\circ}$ C and 5 mm of Hg pressure
A gas behaves like ideal gas at high temperature and low pressure because the mean separation between molecules increases and intermolecular forces are low then. Also, He is an inert gas due which it exists as a single atom, which makes the forces between atoms as low as possible. So, it behaves like an inert gas.

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