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.

STUDY MATERIALS
COURSES
MORE
SUCCESS STORY
ADMISSION
STORE

Back

JEE ADVANCE

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

JEE MAIN

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

NEET

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

BITSAT

CLASS XI - XII

CLASS XI - XII

CBSE BOARD

CLASS IX

CLASS X

CLASS XI

CLASS XII

CLASS VI

CLASS VII

CLASS VIII

UP BOARD

CLASS IX
CLASS X
CLASS XI
CLASS XII

CLASS IX

CLASS X

CLASS XI

CLASS XII

CUET

CRASH COURSE

CRASH COURSE

Courses

CLASSROOM COURSES
ONLINE COURSES

ONLINE COURSES

Q.
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. [2023]

1 A is true but R is false.

2 A is false but R is true.

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

4 Both A and R are true and R is not the correct explanation of A.

Ans.
(2)

If $E_{a} = 0$ , then according to Arrhenius equation, $k = A e^{- E_{a} / R T} \Rightarrow k = A e^{0 / R T} = A .$

This implies that every collision results into a chemical reaction which cannot be true. So, a reaction cannot have zero activation energy.

Solution

1 A is true but R is false.

2 A is false but R is true.

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

4 Both A and R are true and R is not the correct explanation of A.

Ans.
(2)

If $E_{a} = 0$ , then according to Arrhenius equation, $k = A e^{- E_{a} / R T} \Rightarrow k = A e^{0 / R T} = A .$

This implies that every collision results into a chemical reaction which cannot be true. So, a reaction cannot have zero activation energy.

Want Us to Email you About Special Offers & Updates?

Solution

1 A is true but R is false.

2 A is false but R is true.

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

4 Both A and R are true and R is not the correct explanation of A.

Ans. (2) If Ea=0, then according to Arrhenius equation, k=Ae-Ea/RT⇒k=Ae0/RT=A. This implies that every collision results into a chemical reaction which cannot be true. So, a reaction cannot have zero activation energy.

Want Us to Email you About Special Offers & Updates?

Ans.
(2)

If $E_{a} = 0$ , then according to Arrhenius equation, $k = A e^{- E_{a} / R T} \Rightarrow k = A e^{0 / R T} = A .$

This implies that every collision results into a chemical reaction which cannot be true. So, a reaction cannot have zero activation energy.