Question

Assertion :

The coefficient of isothermal expansion at critical point is zero. Reason:

${\left(\frac{\partial V_c}{\partial T_c}\right)}_{P_c}=0$.

Read the above assertion and reason and choose the correct option regarding it.

• 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. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

As we know, coefficient of isothermal expansion is
$\alpha =\frac{{\left(\frac{\partial V}{\partial T}\right)}_{P,n}}{V}$
and at critical point, $V_c,T_c,T_c$ are constant so $\alpha =0$