JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Chemical Kinetics

The correct reaction profile diagram for a positive catalyst reaction.

(A)(see structure)
(B)(see structure)✓ Correct
(C)(see structure)
(D)(see structure)

Answer: (B)

Solution

A positive catalyst offers an alternative pathway with a lower activation energy for both the forward and the backward reaction, so its energy barrier is lower than that of the uncatalysed reaction. It does not change the energies of the reactants or of the products, so the enthalpy change of the reaction stays the same. The correct profile shows the catalysed curve with a lower peak than the uncatalysed curve, while both curves begin at the same reactant level and end at the same product level.

JEE Main · 2023 · 08 Apr 2023 · Shift 2 · Single correct option

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