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Equilibrium MCQs for NEET — Chemistry Questions with Answers

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NEET 2023

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The equilibrium concentrations of the species in the reaction $A + B \rightleftharpoons C + D$ are $2, 3, 10$ and $6\ \text{mol L}^{-1}$, respectively at 300 K. $\Delta G^\circ$ for the reaction is ($R = 2\ \text{cal mol}^{-1} \text{K}^{-1}$):

A. 1372.60 cal B. −137.26 cal C. −1381.80 cal D. −13.73 cal

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Explanation

$K_c = \dfrac{10\times 6}{2\times 3} = 10$. $\Delta G^\circ = -RT\ln K_c = -2(300)(2.303) = -1381.8\ \text{cal}$.

NEET 2024

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For the reaction $2A \rightleftharpoons B + C$, $K_c = 4\times 10^{-3}$. At a given time, the composition of reaction mixture is: $[A] = [B] = [C] = 2\times 10^{-3}\,\text{M}$. Then, which of the following is correct?

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

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Explanation

$Q = [B][C]/[A]^2 = 1 > K_c$, so reaction proceeds backward to lower $Q$.

NEET 2024

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In which of the following equilibria, $K_p$ and $K_c$ are NOT equal?

A. $2\,\text{BrCl}_\text{(g)} \rightleftharpoons \text{Br}_2{}_{(g)} + \text{Cl}_2{}_{(g)}$ B. $\text{PCl}_5{}_{(g)} \rightleftharpoons \text{PCl}_3{}_{(g)} + \text{Cl}_2{}_{(g)}$ C. $\text{H}_2{}_{(g)} + \text{I}_2{}_{(g)} \rightleftharpoons 2\,\text{HI}_\text{(g)}$ D. $\text{CO}_\text{(g)} + \text{H}_2\text{O}_\text{(g)} \rightleftharpoons \text{CO}_2{}_{(g)} + \text{H}_2{}_{(g)}$

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Explanation

$K_p = K_c(RT)^{\Delta n}$. Only (B) has $\Delta n = 1 \ne 0$.

NEET 2024

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Consider the following reaction in a sealed vessel at equilibrium with concentrations of $N_2 = 3.0\times 10^{-3}\,M$, $O_2 = 4.2\times 10^{-3}\,M$ and $NO = 2.8\times 10^{-3}\,M$.

$2\,NO_{(g)} \rightleftharpoons N_2{}_{(g)} + O_2{}_{(g)}$

If $0.1\,\text{mol L}^{-1}$ of $NO_{(g)}$ is taken in a closed vessel, what will be degree of dissociation ($\alpha$) of $NO_{(g)}$ at equilibrium?

A. 0.717 B. 0.00889 C. 0.0889 D. 0.8889

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Explanation

$K_c \approx 1.607$; solving $x^2/(0.1-2x)^2 = K_c$ gives $x \approx 0.0359$, so $\alpha = 2x/0.1 \approx 0.717$.

NEET 2025

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Phosphoric acid ionizes in three steps with their ionization constant values $K_{a_1}$, $K_{a_2}$ and $K_{a_3}$, respectively, while K is the overall ionization constant. Which of the following statements are true? A. $\log K = \log K_{a_1} + \log K_{a_2} + \log K_{a_3}$. B. $\text{H}_3\text{PO}_4$ is a stronger acid than $\text{H}_2\text{PO}_4^-$ and $\text{HPO}_4^{2-}$. C. $K_{a_1} > K_{a_2} > K_{a_3}$. D. $K_{a_1} = \dfrac{K_{a_3}+K_{a_2}}{2}$. Choose the correct answer:

A. A and B only B. A and C only C. B, C and D only D. A, B and C only

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Explanation

$K = K_{a_1}K_{a_2}K_{a_3}\Rightarrow\log K = \sum\log K_{a_i}$ (A true). Successive ionization weakens: $K_{a_1} > K_{a_2} > K_{a_3}$ (C true) and $\text{H}_3\text{PO}_4$ is the strongest (B true). D is false.

NEET 2025

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For the reaction $\text{A(g)} \rightleftharpoons 2\text{B(g)}$, the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500, at 1000 K. [Given: $R = 0.0831\ \text{L atm mol}^{-1}\text{K}^{-1}$] $K_p$ for the reaction at 1000 K is:

A. 83.1 B. $2.077\times10^5$ C. 0.033 D. 0.021

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Explanation

$K_c = \dfrac{k_f}{k_b} = \dfrac{1}{2500}$. $\Delta n = 1$, so $K_p = K_c(RT) = \dfrac{0.0831\times1000}{2500} = 0.033$.

NEET 2025

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Higher yield of NO in $\text{N}_2\text{(g)} + \text{O}_2\text{(g)} \rightleftharpoons 2\text{NO(g)}$ can be obtained at [$\Delta H$ of the reaction $= +180.7\ \text{kJ mol}^{-1}$]: A. higher temperature, B. lower temperature, C. higher concentration of N₂, D. higher concentration of O₂. Choose the correct answer:

A. A, D only B. B, C only C. B, C, D only D. A, C, D only

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Explanation

The reaction is endothermic, so higher temperature (A) favours the forward reaction. Increasing reactant concentrations N₂ (C) and O₂ (D) also shifts equilibrium toward NO. Lower temperature (B) does not.

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