Assertion :An adiabatic process in which no work is performed is an example of a constant energy process. Reason: The change in enthalpy attending an isothermal change in state of an ideal gas must be equal to the change in energy.

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
In thermodynamics, an adiabatic process is one that occurs without transfer of heat or matter between a thermodynamic system and its surroundings.
For a closed system, one may write the first law of thermodynamics thus:
$△ U = Q - W$
For Adiabatic process $Q = 0$
If the system walls are adiabatic, then change in internal energy is equal to the work done.
There is no change in energy in case of isothermal change in state.

Hence, assertion is correct but Reason is incorrect

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