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NEET 2024
Exam
NEET
Year
2024
Subject
Chemistry
Chapter
Chemical Equilibrium

NEET 2024 · Chemistry · Chemical Equilibrium

For the reaction 2 ~A leftharpoons B+C, K_ C =4 × 10^ -3 . At a...

For the reaction 2 A⇌B+C,KC=4×10−32 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{C}}=4 \times 10^{-3}. At a given time, the composition of reaction mixture is: [A]=[B]=[C]=2×10−3M[\mathrm{A}]=[\mathrm{B}]=[\mathrm{C}]=2 \times 10^{-3} \mathrm{M}. Then, which of the following is correct?

Options

  1. AReaction has a tendency to go in forward direction.
  2. BReaction has a tendency to go in backward direction.
  3. CReaction has gone to completion in forward direction.
  4. DReaction is at equilibrium.

Correct answer

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

Step-by-step solution

2 A⇌B+C,KC=4×10−32 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{C}}=4 \times 10^{-3} At a given time t,Qcc\mathrm{t}, \mathrm{Qc}_{\mathrm{c}} is to be calculated and been compared with Kc\mathrm{K}_{\mathrm{c}}. QC=[B][C][A]2=(2×10−3)(2×10−3)(2×10−3)2QC=1\begin{aligned} & \mathrm{Q}_{\mathrm{C}}=\frac{[\mathrm{B}][\mathrm{C}]}{[\mathrm{A}]^2}=\frac{\left(2 \times 10^{-3}\right)\left(2 \times 10^{-3}\right)}{\left(2 \times 10^{-3}\right)^2} \\ & \mathrm{Q}_{\mathrm{C}}=1 \end{aligned} As Qc\gtKcQ_c\gtK_c, so reaction has a tendency to move backward.
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