Assertion: Work done during free expansion of an ideal gas whether reversible or irreversible is positive. Reason: During free expansion, external pressure is always less than the pressure of the system.

Question

Assertion: Work done during free expansion of an ideal gas whether reversible or irreversible is positive. Reason: During free expansion, external pressure is always less than the pressure of the system. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

During the free expansion, in vacuum Pex = 0. Hence, no work is done whether the process is reversible or irreversible.

Q. Assertion : Work done during free expansion of an ideal gas whether reversible or irreversible is positive.
Reason : During free expansion, external pressure is always less than the pressure of the system.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

During the free expansion, in vacuum $P_{e x} = 0$ . Hence, no work is done whether the process is reversible or irreversible.

Q. Assertion : Work done during free expansion of an ideal gas whether reversible or irreversible is positive. Reason : During free expansion, external pressure is always less than the pressure of the system.