(A) More is the value of van der Waal's constant 'a', greater is the tendency of liquefaction.
(R) 'a' measures the magnitude of force of attraction among the molecules.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

Considering the attractive force pressure in ideal gas equation (PV = nRT) is correct by introducing a factor of `(an^2)/(V^2)` where a is a Van der Waal’s constant.