Question

Which gas has the highest critical temperature?

• A. $A$
• B. $B$
• C. $C$
• D. None

Answer 1

The correct option is B $B$

As we know,

$T_c=\frac{8a}{27Rb}$

where,

$Tc$ is the critical temperature

$a$ and $b$ are the Van der Waals constant
$R$ is the universal gas constant

The more the value of $a$, the more will be the $T_c$.

Gas $B$ has the highest value of $a$ as all have the similar value of $b$.
Therefore, gas $B$ has the highest critical temperature.