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The molar heat capacity of oxygen gas at...

The molar heat capacity of oxygen gas at `STP` is nearly `2.5 R`. As the temperature is increased, it gradually increase and approaches `3.5 R`. The most appropriate reason for this behaviour is that at high temperatures

A

oxygen does not behave as an ideal gas

B

oxygen molecules dissociate into atoms

C

the molecules collide more frequenty

D

molecular vibrations gradually become effective

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The correct Answer is:
D
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