For the reaction 2 ~A B+C, Kc=4 10^ -3 . At a given time, the composition of reaction mixture is: [A]=[B]=[C]=2 10^ -3 M. Then, which of the following is correct?

For the reaction 2 ~A B+C, Kc=4 10^ -3 . At a given time, the com…

MCQ

For the reaction $2 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{Kc}=4 \times 10^{-3}$. At a given time, the composition of reaction mixture is: $[A]=[B]=[C]=2 \times 10^{-3} \mathrm{M}$.

Then, which of the following is correct?

A
Reaction has a tendency to go in forward direction.
✓
Reaction has a tendency to go in backward direction.
C
Reaction has gone to completion in forward direction.
D
Reaction is at equilibrium.

✓

Answer

Correct option: B.

Reaction has a tendency to go in backward direction.

b
$2 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{c}}=4 \times 10^{-3}$

At a given time $\mathrm{t}, \mathrm{Q}_{\mathrm{c}}$ is to be calculated and been compared with $\mathrm{K}_{\mathrm{c}}$.

$ Q_c=\frac{[B][C]}{[A]^2}=\frac{\left(2 \times 10^{-3}\right)\left(2 \times 10^{-3}\right)}{\left(2 \times 10^{-3}\right)^2}$

$Q_c=1$

As $Q_c>K_c$, so reaction has a tendency to move backward.

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