WB JEE 2025 | Chemical Equilibrium Question 1 | Chemistry

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

$${1 \over 20}$$

$${1 \over 42}$$

WB JEE 2019

MCQ (Single Correct Answer)

-0.33

In the equilibrium, H₂ + I₂ $$\rightleftharpoons$$ 2HI, if at a given temperature the concentration of the reactants are increased, the value of the equilibrium constant, K_C, will

increase

decrease

remain the same

cannot be predicted with certainty

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