A reaction takes place in various steps. The rate constatn for first, second, third and fifth steps are `k_(1),k_(2),k_(3)` and `k_(5)` respectively The overall rate constant is given by
`k=(k_(2))/(k_(3))(k_(1)/(k_(5)))^(1//2)`
If activation energy are 40, 60, 50, and 10 kJ/mol respectively, the overall energy of activation (kJ/mol) is :
A. 10
B. 20
C. 25
D. none of these
