Assertion :In an adiabatic process change in internal energy of a gas in equal to work done on or by the gas in the process. Reason: Temperature of gas remains constant in an adiabatic process.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In an adiabatic process, no exchange of heat takes place.
Therefore the reason is incorrect.
From the first law of thermodynamics,
$Q = U + W$
$⟹ 0 = U + W$
$⟹ | W | = | U |$
Hence assertion is correct.

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