Question

The activation energy for a simple chemical reaction `A rarr B` is `E_(a)` in the forward reaction: The activation of the reverse reaction
A. can be less than or more than `E_(a)`
B. is always double of `E_(a)`
C. is negative of `E_(a)`
D. is always less than `E_(a)`

Answer 1

Correct Answer - A
For any chemical reaction
`Delta_(r)H^(Ɵ)=(E_(a))_(f)-(E_(a))_(b)`
Since for the order hand, `Delta_(r)H^(Ɵ)` is negative, `(E_(a))_(f)lt(E_(a))_(b)` . On the order hand, `DeltaHƟ)` is positive for an endothermic reaction. Thus, `(E_(a))_(f)gt(E_(a))_(b)`