For a reaction 2A⇌B+C, Kc is 2×10-3. At a given time, the reaction mixture has [A]=[B]=[C]=3×10-4M. Which of the following options is correct?

(A) The system is at equilibrium

(C) The reaction proceeds to the right

TS EAMCET · Chemistry · Chemical Equilibrium

For a reaction $2 A ⇌ B + C, K_{c}$ is $2 \times 10^{- 3} .$ At a given time, the reaction mixture has $[A] = [B] = [C] = 3 \times 10^{- 4} M .$ Which of the following options is correct?

A The system is at equilibrium
B The reaction proceeds to the left
C The reaction proceeds to the right
D The reaction is complete

Verified Solution

Answer & Solution

Correct Answer

(B) The reaction proceeds to the left

Step-by-step Solution

Detailed explanation

If the value of reaction quotient (Q) is higher than that of equilibrium constant (K), the reaction favour reactants more since the amount of products in the system is higher than that of reactants. Then the reaction tends to form more reactants in order to keep the equilibrium…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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