Which of the following is correct ?

Options

A. For a reversible reaction for which `Delta_(f)H = -ve`

B. For reversible reaction for which `Delta_(f)H = +ve`

C.
D. Activation energy of a reaction is a barrier to energy tranfer (KE to PE) between reacting molecules that must be overcome, which is due to need of bonds stretch as well as steric repulsions.

Answer

D

Explanation

Graph in A is plotted for endothermic reaction and graph in B is plotted for exothermic reactions actually.
(C ) `E_(a_(1)) lt E_(a_(2)) lt E_(a_(3))` is correct.