For A 2 + B 2 rightleftharpoons 2 AB E a for forward and backward reaction are 180 and 200 kJ mol -1 respectively. If catalyst lowers E a for both reaction by 100 kJ mol -1 . Which of the following statement is correct?

Catalyst does not alter the Gibbs energy change of a reaction

The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction

Catalyst can cause non-spontaneous reactions to occur

The enthalpy change for the reaction is +20 kJ mol -1

Chemistry · Chemical Kinetics

JEE Main 2025 — 4 April, Morning Shift — Question 13

For $\mathrm{A}_{2}+\mathrm{B}_{2} \rightleftharpoons 2 \mathrm{AB}$ $E_{a}$ for forward and backward reaction are 180 and $200 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. If catalyst lowers $\mathrm{E}_{\mathrm{a}}$ for both reaction by $100 \mathrm{~kJ} \mathrm{~mol}^{-1}$ . Which of the following statement is correct?

Option A:
The enthalpy change for the catalysed reaction is different from that of uncatalysed reaction
Option B:
Catalyst does not alter the Gibbs energy change of a reaction
Correct
Option C:
Catalyst can cause non-spontaneous reactions to occur
Option D:
The enthalpy change for the reaction is +20 kJ $\mathrm{mol}^{-1}$

Answer: B

Step-by-step solution

Catalyst cannot cause non-spontaneous reaction to occur, it only reduces activation energy of the reaction.

Answer key and solution verified before publishing.

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Exam: JEE Main 2025
Paper: 4 April, Morning Shift
Subject: Chemistry
Chapter: Chemical Kinetics
Topic: Arrhenius Equation

Rate law for a reaction between A and B is given by r= k[ A]^ n[ B]^ m If concentration of A is doubled and concentration of B is halved…

Answer: B

Step-by-step solution

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