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Question

A reaction takes place in three steps. The rate constant of the three steps are k1,k2 and k3 respectively. The overall rate constant k=k1k3k2. The energy of activation for the three steps are 40, 30 and 20 kJ respectively. Therefore:



Your Answer
A

Overall energy of activation is 10 kJ.

Correct Answer
B

Overall energy of activation is 30 kJ.

Correct Answer
C

The reaction mechanism is 2Ak1k2A+A;Ak3rds Product and overall order is one.

Your Answer
D

The reaction mechanism is Ak1B;Bk2C;Ck3 Product and overall order is one.


Solution

The correct options are
B

Overall energy of activation is 30 kJ.


C

The reaction mechanism is 2Ak1k2A+A;Ak3rds Product and overall order is one.


Since, overall rate constant k=k1k3k2
So, total energy of activation is
Ea1+Ea3Ea240+2030=30kJ
2Ak1k2A+A;Ak3−−RDS Product
This satisfied the condition k=k1k3k2 and overall order is one.

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