Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. \textbf{Assertion A:} A reaction can have zero activation energy. \textbf{Reason R:} The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to the threshold value is called activation energy. In the light of the above statements, choose the correct answer from the options given below:
Answer: (B) Both A and R are true and R is not the correct explanation of A. \textbf{Answer:} (B) Both A and R are true and R is not the correct explanation of A \textbf{Solution:} Activation energy is .
- A.Both A and R are true and R is the correct explanation of A
- B.Both A and R are true and R is not the correct explanation of A✓
- C.A is true but R is false
- D.A is false but R is true
Correct Answer
(B) Both A and R are true and R is not the correct explanation of A
Solution & Explanation
\textbf{Answer:} (B) Both A and R are true and R is not the correct explanation of A \textbf{Solution:} Activation energy is . A reaction can have when reactant molecules already possess energy equal to the threshold value, so Assertion A is true. Reason R correctly defines as the minimum extra energy reactant molecules must absorb to reach the threshold value, so R is true. However, this definition does not by itself explain \textit{why} a reaction can have zero activation energy. Hence both A and R are true, but R is not the correct explanation of A.