Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first ? Justify your answer

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#1

When an electron is added to oxygen atom to form ${{O}^{-}}$ ion energy is released. But when another electron is added to ${{O}^{-}}$ ion to form ${{O}^{2-}}$ ion energy is absorbed to overcome the strong electrostatic repulsion between the negatively charged ${{O}^{-}}$ ion and the new electron being added. The second electron gain enthalpy of O is positive.
Thus, first electron gain enthalpy :

Second electron gain enthalpy :