Assertion : For an isothermal reversible process Q = -W i.e. work… - Vidyadip

MCQ

Assertion : For an isothermal reversible process $Q = -W$ i.e. work done by the system equals the heat absorbed by the system.
Reason : Enthalpy change $(\Delta H)$ is zero for isothermal process.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
✓
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

✓

Answer

Correct option: B.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

b
In an isothermal process change in internal energy $(\Delta E)$ is zero (as it is a function of temperature.)

$\therefore $ According to first law of thermodynamics

$\because $ $Q+W=\Delta E$. Hence $Q=-W$ (if $\Delta E=0$)

If a system undergoes a change in which internal energy of the system remains constant (i.e. $\Delta E=0$) then $-W=Q$. this means that work done by the system equals the heat absorbed by the system.

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