Which of the following processes involves absorption of energy?

Options

A. `C1 + e^(-) to C1^(-)`
B. `O^(-) + e^(-) to O^(2-)`
C. `O + e^(-) to O^(-)`
D. `S + e^(-) to S^(-)`

Answer

B

Explanation

The second electron gain enthalpy of an element is positive i.e., energy is absorbed. Thus option ( b) is correct.