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Chemistry · Chemical Equilibrium

NEET (UG) 2024 — Question 53

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[A]=[B]=[C]=2 \times 10^{-3} \mathrm{M}.

Then, which of the following is correct?

  1. Option A:

    Reaction is at equilibrium.

  2. Option B:

    Reaction has a tendency to go in forward direction.

  3. Option C:

    Reaction has a tendency to go in backward direction.

    Correct
  4. Option D:

    Reaction has gone to completion in forward direction.

Answer: C

Step-by-step solution

2A⇌B+C,KC=4×10−32 A \rightleftharpoons B+C, K_{C}=4 \times 10^{-3}

At a given time t,Qct_{,} Q_{c} is to be calculated and been compared with KcK_{c}.

QC=[B][C][A]2=(2×10−3)(2×10−3)(2×10−3)2Q_{C}=\frac{[B][C]}{[A]^{2}}=\frac{\left(2 \times 10^{-3}\right)\left(2 \times 10^{-3}\right)}{\left(2 \times 10^{-3}\right)^{2}}

QC=1Q_{C}=1

As Qc>KcQ_{c}>K_{c}, so reaction has a tendency to move backward.

Answer key and solution verified before publishing.

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Exam
NEET (UG) 2024
Paper
2024 paper
Subject
Chemistry
Chapter
Chemical Equilibrium
Topic
Analysis of Chemical Equilibrium, Equilibrium Constant and Reaction Quotient

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