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JEE Main 2025 Apr 3 Shift 1, Chemistry Q3: Factors Affecting Equilibria

JEE Main2025Apr 3, Shift 1Chemistry
Q.

Given below are two statements

Statement I : A catalyst cannot alter the equilibrium constant () of the reaction, temperature remaining constant

Statement II : A homogenous catalyst can change the equilibrium composition of a system temperature remaining constant

In the light of the above statements, choose the correct answer from the options given below

  1. A

    Statement I is false but Statement II is true

  2. B

    Both Statement I and Statement II are true

  3. C

    Both Statement I and Statement II is false

  4. D

    Statement I is true but Statement II is false

Solution

Statement I: At constant temperature, depends only on , which a catalyst cannot change. A catalyst speeds up forward and reverse rates equally and does not alter . True.

Statement II: While is fixed, the equilibrium composition (mole fractions / partial pressures) can shift if the catalyst introduction is accompanied by a change in total moles or volume, e.g. addition of a homogeneous catalyst at constant total pressure can alter the partial pressures of reactants and products and thereby change the composition even though stays the same. True.

Both statements are correct.

Concept behind this question

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