Which of the following chemical changes can occur with the greatest ease?

Options

A. `N to N^(-)`
B. `N^(-) to N^(2-)`
C. `N^(2-) to N^(2-)`
D. `O to O^(-)`

Answer

D

Explanation

Though adding an electron to N–2 will also make it attain noble gas configuration but adding a third electron to the same atom without adding any protons is very difficult as the incoming third electron will be highly repelled by the already present electrons. Converting O to will be easy.