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The activation energy of exothermic reac...

The activation energy of exothermic reaction `ArarrB` is 80 kJ `mol^(-1)`. The heat of reaction is 200 kJ `mol^(-1)`. The activation energy for the reaction `BrarrA` (in kJ `mol^(-1)`) will be

A

a) 80

B

b) 120

C

c) 40

D

d) 280

Text Solution

Verified by Experts

The correct Answer is:
D
`E_(a)` (activation energy)
`(ArarrB)=80kJmol^(-1)`
Heat of reaction `(ArarrB)=200kJmol^(-1)`
For `(BrarrA)` backward reaction
`E_(a)(BrarrA)=E_(a)(ArarrB)+` heat of reaction
`=80+200=280kJmol^(-1)`
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