van der Waals' constants ' $a$ ' of $\mathrm{CO}_2$ and $\mathrm{NH}_3$ are greater than that of $\mathrm{N}_2$.

Van der Waals' constant ' $a$ ' of $\mathrm{CO}_2$ and $\mathrm{NH}_3$ are less than that of $\mathrm{N}_2$.

' $a$ ' $\left(\mathrm{NH}_3\right)>$ ' $a$ ' $\left(\mathrm{N}_2\right)$ but ' $a$ ' $\left(\mathrm{CO}_2\right)<$ ' $a$ ' $\left(\mathrm{N}_2\right)$

' $a$ ' $\left(\mathrm{NH}_3\right)<$ ' $a$ ' $\left(\mathrm{N}_2\right)$ but ' $a$ ' $\left(\mathrm{CO}_2\right)>$ ' $a$ ' $\left(\mathrm{N}_2\right)$

$A$

$B$

$C$

$D$

$\mathrm{H}_2 \mathrm{O}$ and $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$

$\mathrm{Cl}_2$ and $\mathrm{CCl}_4$

$\mathrm{NH}_3$ and $\mathrm{H}_2$

$\mathrm{SiF}_4$ and $\mathrm{BF}_3$

15 atm

10 atm

3 atm

6 atm