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Chemical Equilibrium question

2025 · 3 Apr · Shift 1 · Q17
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Chemical Equilibrium question

2025 · 3 Apr · Shift 1 · Q17

JEE MainChemistryChemical EquilibriumMCQ+4 / −1
Given below are two statements : Statement I : A catalyst cannot alter the equilibrium constant (Kc)\left(\mathrm{K}_{\mathrm{c}}\right)(Kc​) 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 true but Statement II is false
  2. B
    Statement I is false but Statement II is true
  3. C
    Both Statement I and Statement II are true
  4. D
    Both Statement I and Statement II are false
View written solutionFree

Correct answer: A

  1. Analyze Statement I

    Statement I says: A catalyst cannot alter the equilibrium constant KcK_cKc​ of the reaction, temperature remaining constant.

    • The equilibrium constant KcK_cKc​ depends only on temperature.
    • A catalyst changes the rate of forward and backward reactions equally by lowering activation energy for both directions.
    • Therefore, it helps the system reach equilibrium faster, but it does not change the value of KcK_cKc​.

    Hence, Statement I is true.

  2. Analyze Statement II

    Statement II says: A homogeneous catalyst can change the equilibrium composition of a system, temperature remaining constant.

    • Since a catalyst does not change KcK_cKc​, the equilibrium position/composition at a given temperature remains unchanged.
    • A homogeneous catalyst only speeds up attainment of equilibrium.
    • It does not shift equilibrium or change equilibrium composition.

    Hence, Statement II is false.

  3. Evaluate the options

    • A: Statement I is true but Statement II is false ✅
    • B: Statement I is false but Statement II is true ❌
    • C: Both Statement I and Statement II are true ❌
    • D: Both Statement I and Statement II are false ❌

  4. Final Answer

    The correct option is: A\boxed{A}A​

  5. Comparison with stored correct answer

    • Derived answer: AAA
    • Stored correct answer: AAA

    They match.

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