When the first electron gain enthalpy `(triangle_(eg)H)` of oxygen is `-141 kJ//mol,` its second electron gain enthalpy is :

Options

A. almost the same as that of the first
B. negative, but less negative than the first
C. a positive value
D. a more negative value than the first

Answer

C

Explanation

Second electron gain enthalpy is always positive for an element because energy is required to add the second electron to negatively charged ion.