For the reaction . At a given time, the composition of the reaction mixture is: . Then, which of the following is correct? [2024]

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

Then, which of the following is correct [2024]

1 Reaction is at equilibrium.

2 Reaction has a tendency to go in forward direction.

3 Reaction has a tendency to go in backward direction.

4 Reaction has gone to completion in forward direction.

Ans.
(3)

For the reaction,

$2A ⇌ B + C; K_{C} = 4 \times 10^{- 3}$

$Q_{C} = \frac{[B] [C]}{[A]^{2}} = \frac{2 \times 10^{- 3} \times 2 \times 10^{- 3}}{{(2 \times 10^{- 3})}^{2}} = 1$

Since $Q_{C} > K_{C}$ , hence, the reaction will proceed in the direction of reactants (i.e., backward direction).

Solution

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

Then, which of the following is correct [2024]

1 Reaction is at equilibrium.

2 Reaction has a tendency to go in forward direction.

3 Reaction has a tendency to go in backward direction.

4 Reaction has gone to completion in forward direction.

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Solution

Q. For the reaction 2A⇌B+C, Kc=4×10-3. At a given time, the composition of the reaction mixture is: [A]=[B]=[C]=2×10-3M. Then, which of the following is correct [2024]

1 Reaction is at equilibrium.

2 Reaction has a tendency to go in forward direction.

3 Reaction has a tendency to go in backward direction.

4 Reaction has gone to completion in forward direction.

Ans. (3) For the reaction, 2A⇌B+C ; KC=4×10-3 QC=[B][C][A]2=2×10-3×2×10-3(2×10-3)2=1 Since QC>KC, hence, the reaction will proceed in the direction of reactants (i.e., backward direction).

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

Then, which of the following is correct [2024]