Correct Answer - D
`PCl_(5) hArr PCl_(3)+Cl_(2)`
Degree of dissociation ( or quantity of products formed )
`xprop((1)/(P))^(Deltan_(g)//2)`,
where P is the total pressure.
Here `Deltan_(g)=2-1=1`
`:. xprop ((1)/(P))^((1)/(2))` or `x prop sqrt((1)/(P))`