For the reaction A(g) + B(g) → 3C(g) at 25 °C, a 3 litre vessel contains 1, 2, 4 mole of A, B and C respectively. If KC for the reaction is 10, the reaction will proceed in

Q: For the reaction :
$A(g) + B(g) \rightleftharpoons 3C(g) $ at 25 °C, a 3 litre vessel contains 1, 2, 4 mole of A, B and C respectively. If KC for the reaction is 10, the reaction will proceed in

(A) Forward direction

(B) Backward direction

(C) In either direction

(D) In equilibrium

Sol: $[C] = \frac{4}{3}$

$[A] = \frac{1}{3}$

$[B] = \frac{2}{3}$

$\large Q = \frac{[C]^3}{[A][B]}$

$\large Q = \frac{[4/3]^3}{[1/3][2/3]}$

Q = 10.66

As , KC = 10

Q > KC

Reaction will proceed in backward direction .

Ans: (B)