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Topic: Effect of temperature, Arrhenius equation, activation energy· Chemical Kinetics

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.Reasons R : The minimum extra amount of energy absorbed by reactant molecules so that thei…

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.

Reasons 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 is false but R is true.

2. Both A and R are true and R is the correct explanation of A.

3. Both A and R are true and R is NOT the correct explanation of A.

4. A is true but R is false.

Doubtly Asked NEET UG 2023 Practice test neet Save WhatsApp Report
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Answer: 1. A is false but R is true.

Key idea: Activation energy is the extra energy reactants must absorb to reach the threshold energy: \(E_a = E_{threshold} - E_{reactants}\).

Statement R is exactly this NCERT definition, so R is true.

Statement A is false at this level. In the Arrhenius equation \(k = Ae^{-E_a/RT}\), \(E_a = 0\) would mean every collision gives product. Ordinary reactions need reactant molecules to cross an energy barrier, so \(E_a\) is always positive.

A false, R true: option 1.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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