Which of the following transitions involves maximum amount of energy?

Options

A. `M-(g) rarr M(g)`
B. `M(g) rarr M^(+)(g)`
C. `M^(+)(g) rarr M^(2+)(g)`
D. `M^(2+)(g) rarr M^(3+)(g)`

Answer

D

Explanation

`M^(2+) rarr M^(3+)` . After the removal of `2e^(-)` the nuclear charge per `e^(-)` increases, due to which high energy is requried to remove `3e^(-)`.