Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason $R$
Assertion A: Amongst $He, Ne, Ar$ and $Kr$; $1 g$ of activated charcoal adsorbs more of $Kr$
Reason R: The critical volume $V_c\left( cm ^3 mol ^{-1}\right)$ and critical pressure $P_e$ (atm) is highest for Krypton but the compressibility factor at critical point $Z_c$ is lowest for Krypton 
In the light of the above statements, choose the correct answer from the options given below

• A. Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$
• B. Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
• C. A is false but $R$ is true
• D. $A$ is true but $R$ is false

Answer 1

The Correct Option is D

The correct answer is option (D) : A is true but R is false

Adsorption ∝ vanderwaal attraction forces 

Z_c​=\(\frac{3}{8}\)​ for all natural gases.