For the reaction 2A leftharpoons B + C , K_c = 4 × 10^-3 . At a given time, [A] = [B] = [C] = 2 × 10^-3 M . Which of the following is correct? - Chemistry MCQ NEET (UG) 2024 2026 | ExamTest.live

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For the reaction 2 A ⇌ B + C, K_{c} = 4 \times 1 0^{- 3} . At a given time, [A] = [B] = [C] = 2 \times 1 0^{- 3} M . Which of the following is correct?

Solution & Step-by-step Explanation

To determine the direction of the reaction, we calculate the reaction quotient Q_{c} : Q_{c} = \frac{[ B ] [ C ]}{[ A ] ^{2}} Given [A] = [B] = [C] = 2 \times 1 0^{- 3} M : Q_{c} = \frac{( 2 \times 1 0 ^{- 3} ) ( 2 \times 1 0 ^{- 3} )}{( 2 \times 1 0 ^{- 3} ) ^{2}} = 1 Since Q_{c} = 1 and K_{c} = 4 \times 1 0^{- 3}, we have Q_{c} > K_{c} .When Q_{c} > K_{c}, the reaction shifts in the backward direction to reach equilibrium.

Try it yourself before checking the explanation above.

For the reaction 2 A ⇌ B + C, K_{c} = 4 \times 1 0^{- 3} . At a given time, [A] = [B] = [C] = 2 \times 1 0^{- 3} M . Which of the following is correct?

Reaction has a tendency to go in forward direction.

Reaction has a tendency to go in backward direction.

Reaction has gone to completion in forward direction.

Reaction is at equilibrium.

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