Assertion: The dissociation of `PC1_(5)` decreases on increase.
Reason: An increase in pressure favours the forward reaction.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

C

Explanation

`{:(PCl_(5),hArr,PCl_(3),+,Cl_(2)),(1,,0,,0),(1-alpha,,alpha,,alpha):}`
`K_(p) = [(alpha^(2))/(1-alpha)] [(P)/(1+alpha)]^(1)`
An increase in pressure will decrease `alpha`, to have `K_(p)` constant and thus backward reaction occurs.