Question

Assertion :Excluded volume or co-volume equals to ($V-nb$) for $n$ moles. Reason: Co-volume depends on the effective size of gas molecules.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

The effective volume or co-volume or excluded volume of the molecules in motion is four times the actual volume of the molecules at rest.
$b=4V_m=\left[\frac{4}{3}\pi r^3\right]\times 4N$
Hence, the co volume is proportional to the actual size of the gas molecules.
Hence, both assertion and reason are incorrect.