Assertion : The heat absorbed during the isothermal expansion of an ideal gas against vacuum is zero.
Reason : The volume occupied by the molecules of an ideal gas is zero.

Options

A. A and (R) are correct and (R) is the correct explanation of(A).
B. both (A) and (R) are correct, but (R) is not the correct explanation of(A).
C. If(A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

B

Explanation

There is no force of attraction between molecules of an ideal gas and no work has to be done in tearing apart the molecules during expansion.