NEET 2024 — Chemistry solution

NEET2024Chemistry

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

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

Solution

Reaction quotient $Q_{c} = \frac{[ B ] [ C ]}{[ A ] ^{2}} = \frac{( 2 \times 1 0 ^{- 3} ) ^{2}}{( 2 \times 1 0 ^{- 3} ) ^{2}} = 1$ .

Since $Q_{c} > K_{c}$ ( $1 > 4 \times 1 0^{- 3}$ ), the system shifts backward to reach equilibrium.

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