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 an 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_(c) = (x^(2))/(V(a-x))`. Addition of inert gas at constant V has effect no reactions having effect if `Delta n = 0`. The given reaction has `Delta n ne 0` and thus only choice (c ) is correct. Also, the effect may be drawn as : on addition of inert gas at constant P, volume increases. To have `K_(c )` constant, x must increase.