When the first electron gain enthalpy
Question:

When the first electron gain enthalpy $\left(\Delta_{\mathrm{eg}} \mathrm{H}\right)$ of oxygen is – $141 \mathrm{~kJ} / \mathrm{mol}$, its second electron gain enthalpy is:

1. a more negative value than the first

2. almost the same as that of the first

3. negative, but less negative than the first

4. a positive value

Correct Option: , 4

Solution:

The second electron gain enthalpy of oxygen is positive as energy has to be added for the addition of another electron.