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Chemical Kinetics and Nuclear Chemistry question

2023 · 8 Apr · Shift 2 · Q9
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Chemical Kinetics and Nuclear Chemistry question

2023 · 8 Apr · Shift 2 · Q9

JEE MainChemistryChemical Kinetics and Nuclear ChemistryMCQ+4 / −1
The correct reaction profile diagram for a positive catalyst reaction.
  1. A
    JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Chemical Kinetics and Nuclear Chemistry Question 49 English Option 1
  2. B
    JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Chemical Kinetics and Nuclear Chemistry Question 49 English Option 2
  3. C
    JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Chemical Kinetics and Nuclear Chemistry Question 49 English Option 3
  4. D
    JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Chemical Kinetics and Nuclear Chemistry Question 49 English Option 4
View written solutionFree

Correct answer: D

  1. Effect of a positive catalyst on reaction profile

A positive catalyst:

  • provides an alternative reaction pathway,
  • lowers the activation energy EaE_aEa​,
  • does not change the enthalpy change of reaction ΔH\Delta HΔH.

So, in an energy profile diagram:

  • the energy of reactants and products remains the same as in the uncatalysed reaction,
  • only the height of the peak (activation barrier) decreases for the catalysed path.
  1. What the correct graph must show

For a catalysed reaction profile:

  • same initial energy level,
  • same final energy level,
  • lower peak compared to the uncatalysed path.
  1. Matching with options

Although the option diagrams are not visible here, the correct option must be the one showing:

  • unchanged reactant and product energies,
  • reduced activation energy.

Given the stored correct answer is D, this corresponds to the standard correct catalytic reaction profile.

  1. Conclusion

Hence, the correct reaction profile diagram for a positive catalyst reaction is Option D.

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