Topic: Law of chemical equilibrium, Kp and Kc· Equilibrium

For the reaction 2A ⇌ B + C, K_c = 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?

1. Reaction has gone to completion in forward direction.

2. Reaction is at equilibrium.

3. Reaction has a tendency to go in forward direction.

4. Reaction has a tendency to go in backward direction.

Doubtly Asked 30 Oct 2026 NEET UG 2024 Practice test neet Save WhatsApp Report

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Answer: 4. Reaction has a tendency to go in backward direction.

Key idea: compare the reaction quotient $Q_c$ with $K_c$.

$$Q_c=\frac{[B][C]}{[A]^2}=\frac{(2\times10^{-3})(2\times10^{-3})}{(2\times10^{-3})^2}=1$$

Since $Q_c=1 > K_c=4\times10^{-3}$, the mixture has too many products, so the reaction shifts backward. Option 4. It is not at equilibrium ($Q\ne K$) and not complete.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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For the reaction 2A ⇌ B + C, K_c = 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?

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