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Standard XII

Chemistry

Characteristics of Equilibrium Constant

The value of ...

Question

The value of $k_{c}$ for the reaction
$2 A ⇌ B + C$ is 2 x $10^{- 3}$
At a given time the composition of reaction mixture is [A] = [B] = [C] = 3 x $10^{- 4}$ M. In which direction the reaction will proceed?

From left to right

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From right to left

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The reaction is at equilibrium

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First to the right than left

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Solution

The correct option is B From right to left
For this reaction
$2 A ⇌ B + C$
$K_{c} = 2 \times 10^{- 3} [[A] = [B] = [C]]$
$Q_{c} = \frac{[B] [C]}{[A]^{2}}$
$= \frac{[3 \times 10^{- 4}] [3 \times 10^{- 4}}{[3 \times 10^{- 4}]^{4}}$
$Q_{c} = 1$
value of $K_{c} = 2 \times 10^{- 3}$
Since $Q_{c} > K_{c}$ the direction of reaction is bckwards
So ans B is correct

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The value of kc for the reaction 2A⇌B+C is 2 x 10−3At a given time the composition of reaction mixture is [A] = [B] = [C] = 3 x 10−4 M. In which direction the reaction will proceed?

The correct option is B From right to leftFor this reaction 2A⇌B+CKc=2×10−3[[A]=[B]=[C]]Qc=[B][C][A]2=[3×10−4][3×10−4[3×10−4]4Qc=1value of Kc=2×10−3Since Qc>Kc the direction of reaction is bckwardsSo ans B is correct

The value of $k_{c}$ for the reaction
$2 A ⇌ B + C$ is 2 x $10^{- 3}$
At a given time the composition of reaction mixture is [A] = [B] = [C] = 3 x $10^{- 4}$ M. In which direction the reaction will proceed?