Question

In each of the following question, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer:

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

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

Answer 1

The correct option is B If the both (A) and (R) are correct, but (R) is not the correct explanation for (A).

The heat absorbed during the isothermal expansionn of an ideal gas against vacuum is zero. This is because there are no forces of attraction between the gas molecules. The volume occupied by the molecules of an ideal gas is zero. For an ideal gas, they are point molecules.