Assertion :During an adiabatic process, heat energy is not exchanged between system and its surroundings. Reason: The temperature of a gas increases when it undergoes an adiabatic expansion.

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

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

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
During adiabatic process $q = 0$ , this means that there is no exchange of heat between system and surrounding.

So, the Assertion is correct.

When a gas undergoes adiabatic expansion, the energy required is at the cost of a decrease in internal energy.

Hence, the temperature of the gas decreases during adiabatic expansion.

So, the reason is incorrect.

Hence, option C is correct.

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