Indian Forest Service (Mains), Chemistry optional · 2022 · Paper I

Q8(c)(ii). Zero or negative activation energy

5 marks
Topic: Chemical kinetics
Question only

Question

Can the activation energy of a reaction be zero or negative? Explain your answer.

Model answer

The free solution for 2022 answers questions 1, 2, 4, 5 and 6, the ones picked in its time plan. Question 8 is answered in full in the IFoS Chemistry Paper I, 2021 to 2025 book, with every part of every paper.

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VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.

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UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025

All eight questions of each paper, with the question printed above its answer
Physical chemistry numericals worked with units; inorganic structures drawn
Topic-wise weightage and a topic-wise index

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Topic notes: Arrhenius equation, collision theory and transition-state theory, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversactivation energynegative activation energyArrhenius equationpre-equilibriumradical recombination

All parts of Question 8

8(a) Cooperativity and the Bohr effect10 marks
8(b)(i) Sodium solutions in liquid ammonia10 marks
8(b)(ii) Reducing reactions of sodium–ammonia5 marks
8(c)(i) Equilibrium and relaxation of an isomerisation10 marks
8(c)(ii) Zero or negative activation energy5 marks