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# 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.(A) Both reason and assertion are correct and reason is the correct explanation for assertion.(B) Both reason and assertion are correct but reason is not the correct explanation for assertion.(C) Assertion is correct but reason is incorrect.(D) Assertion is incorrect but reason is correct.

Last updated date: 14th Jul 2024
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Hint : In thermodynamics, an adiabatic process can be defined as a thermodynamic process which takes place without transferring heat or mass between the system and its surroundings but it transfers energy to its surroundings only as work. In this process, we can notice gas compression and heat is generated.

A thermodynamic process in which the temperature of a system is constant is called isothermal process. Thermal equilibrium is maintained as the transfer of heat into or out of the system takes place very slowly. Heat is not transferred between the system and its surroundings in an adiabatic process. For a closed system, we can write the first law of thermodynamics as: $\Delta U = Q - W$
For an adiabatic process: $Q = 0$