Assertion: In isothermal process, whole of the heat energy supplied to the body is converted into internal energy.
Reason: According to the first law of thermodynamics.

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

Assertion is incorrect but Reason is correct.

Assertion is correct but Reason is incorrect.

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

answer is D.

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Detailed Solution

As in isothermal process, temperature remains constant, internal energy ( $∆$ U = 0), hence there is no change in internal energy of the system. Hence, the energy taken by the gas is utilised by doing work against external pressure.
Hence, whole heat energy given to the body in isothermal process gets converted into work done.
But, $∆$ Q = $∆$ U + $∆$ W is the relation of first law of thermodynamics.

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