Q.

Assertion : Vibrational degree of freedom of a diatomic gas molecule appears at every high temperature.Reason : Diatomic gas has two vibrational degree of freedom in one direction. [AIIMS 2019]

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a

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

b

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

c

Assertion is correct but Reason is incorrect.

d

Both Assertion and Reason are incorrect.

answer is B.

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Detailed Solution

There are two vibrational degree of freedom of diatomic gas molecules at high temperature , one is kinetic mode  and the other is potential mode. At low temperature the atoms of a diatomic gas are assumed to be connected to each other by a massless rigid rod, at high temperature this rod behaves like a spring and the atoms start vibrating .
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Assertion : Vibrational degree of freedom of a diatomic gas molecule appears at every high temperature.Reason : Diatomic gas has two vibrational degree of freedom in one direction. [AIIMS 2019]