Question

For a very small extent of dissociation of `PCl_(5)` into `PCl_(3)` and `Cl_(2)` is a gaseous phase reaction then degree of dissociation , x `:`
A. `x prop P`
B. `x prop (1)/(P)`
C. `x prop sqrt(P)`
D. `x prop sqrt((1)/(P))`

Answer 1

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))`