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.

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