Q. An endothermic reaction $A \rightarrow B$ has an activation energy of 15 kcal/mol and the energy of reaction is 5 kcal/mol. The activation energy for the reaction $B \rightarrow A$ is
A) 20 kcal/mol
B) 15 kcal/mol
C) 10 kcal/mol
D) Zero
Explanation
(c)
For endothermic reaction $A \rightarrow B$
Activation energy $= 15\ kcal/mol$
Energy of reaction $= 5\ kcal/mol$
Hence, activation energy for the reaction $B \rightarrow A$ is $15 - 5 = 10\ kcal/mol$
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.