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The molar heat capacity of oxygen gas at...

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

A

oyxgen does not behave as an ideal gas

B

oxygen molecules dissociate in atoms

C

the molecules collide more frequently

D

molecular vibrations gradually become effective.

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The correct Answer is:
A
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