WB JEE 2026 | Chemical Equilibrium Question 1 | Chemistry

WB JEE 2026

MCQ (Single Correct Answer)

-0.25

For the reaction $A \rightarrow B$ ，variation of concentration is plotted against time as shown below．

WB JEE 2026 Chemistry - Chemical Equilibrium Question 1 English

Which of the following statements is true？

Region（1）indicates equilibrium

Region（2）indicates equilibrium

Region（3）indicates equilibrium

Both the Regions（2）and（3）indicate equilibrium

WB JEE 2025

MCQ (Single Correct Answer)

-0.5

Consider the following gas phase dissociation, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ with equilibrium constant $K_P$ at a particular temperature and at pressure $P$. The degree of dissociation ( $\alpha$ ) for $\mathrm{PCl}_5(\mathrm{~g})$ is

$\alpha=\left(\frac{\mathrm{K}_{\mathrm{P}}}{\mathrm{K}_{\mathrm{P}}+\mathrm{P}}\right)^{1 / 3}$

$\boldsymbol{\alpha}=\left(\frac{\mathrm{K}_{\mathrm{P}}}{\mathrm{K}_{\mathrm{P}}+\mathrm{P}}\right)$

$\alpha=\left(\frac{\mathrm{K}_{\mathrm{P}}}{\mathrm{K}_{\mathrm{P}}+\mathrm{P}}\right)^{1 / 2}$

$\alpha=\left(\frac{\mathrm{K}_{\mathrm{P}}}{\mathrm{K}_{\mathrm{P}}+\mathrm{P}}\right)^2$

WB JEE 2024

MCQ (Single Correct Answer)

-0.25

Which of the following statements is true about equilibrium constant and rate constant of a single step chemical reaction?

Equilibrium constant may increase or decrease but rate constant always increases with temperature.

Both equilibrium constant and rate constant increase with temperature.

Rate constant may increase or decrease but equilibrium constant always increases with temperature.

Both equilibrium constant and rate constant decrease with temperature.

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The equilibrium constant for the following reactions are given at 25$$^\circ $$C

$$2A$$ $$\rightleftharpoons$$ B + C, K₁ = 1.0

$$2B$$ $$\rightleftharpoons$$ C + D, K₂ = 16

$$2C + 2D$$ $$\rightleftharpoons$$ 2P, K₃ = 25

The equilibrium constant for the reaction

P $$\rightleftharpoons$$ $$A + {1 \over 2}$$B at 25$$^\circ $$C is

$${1 \over 20}$$

$${1 \over 42}$$

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