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

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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Answer :

Ans. Second electron affinity of O is largely +ve because of repulsion between negatively charged ions and second electron to be added. Energy required to overcome repulsion is more than the energy released in gaining electron, so net energy is absorbed.
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