Chemistry · Chemical Kinetics
NEET (UG) 2023 — Question 51
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A reaction can have zero activation energy.
Reason (R): The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy.
In light of the above statements, choose the most appropriate answer from the options given below:
- Option A:
Both (A) and (R) are true and (R) is the correct explanation of (A).
- Option B:Correct
Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
- Option C:
(A) is true but (R) is false.
- Option D:
(A) is false but (R) is true.
Answer: B
Step-by-step solution
Assertion (A) is true: A reaction can have zero activation energy, as observed in some diffusion-controlled reactions. Reason (R) is true: Activation energy is defined as the minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to the threshold value. However, (R) is not the correct explanation of (A): The reason only states the definition of activation energy and does not explain why a reaction can have zero activation energy. Thus, Both (A) and (R) are true and (R) is NOT the correct explanation of (A).
Answer key and solution verified before publishing.
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- Exam
- NEET (UG) 2023
- Paper
- 2023 paper
- Subject
- Chemistry
- Chapter
- Chemical Kinetics
- Topic
- Arrhenius Equation