For the reaction, `P Cl _(5 (g)) hArr PCl _(3 (g)) ` The forward reaction at constant temperature is favoured by: Introducing an inert gas at constant volume, Introducing chlorine gas at constant volume, Introducing ani inert gas at constant pressure, None of these

Options

A. Introducing an inert gas at constant volume
B. Introducing chlorine gas at constant volume
C. Introducing ani inert gas at constant pressure
D. None of these

Answer

C

Explanation

`PCl _(5(g)) hArr PCl _(3 (g)) + Cl _(2 (g))`
Mole at eq. `(a-x)" " x" "x`
Now, `K _(a) = ( x ^(2))/( V( a- x)).`Addition of inert gs at constatn V has no effect on reactions having `Delta n = 0 or Delta n ne 0.` But addition of inert gas at constatn P has effect on reactions having `Delta n ne 0,` and no drawn as on addition of inert gas at constatn P, volume increases. To have `K _(c)` constant x must increase.