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easyMCQNEET 20232026Chemistry
1 mark

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 the light of the above statements, choose the correct answer from the options given below:

  1. A
    Both A and R are true and R is the correct explanation of A
  2. B
    Both A and R are true and R is not the correct explanation of A
  3. C
    A is true but R is false
  4. D
    A is false but R is true

Solution & Step-by-step Explanation

Assertion A is true: Technically, some radical recombinations or very fast reactions can have an activation energy () of zero.Reason R is true: This is the standard definition of activation energy.However, the definition of activation energy (R) does not explain why or how a reaction can specifically have a value of zero (A). Thus, R is not the explanation for A.

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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 the light of the above statements, choose the correct answer from the options given below:
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

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chemical kineticsactivation energy

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