Q77 / 200 · NEET 2023 (All India) · Chemistry

Given below are two statements: one labelled as Assertion A and 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.

  • Correct answer
    A
    A is false but R is true.
  • B
    Both A and R are true and R is the correct explanation of A.
  • C
    Both A and R are true and R is not the correct explanation of A.
  • D
    A is true but R is false.

Solution

Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into a product.  If Ea=0 , then according to Arrhenius equation k=Ae−Ea/RT=Ae0=A . This implies that every collision results into a chemical reaction which cannot be true. So, a reaction cannot have zero activation energy.

Hence, the correct answer is option: 'A'.

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