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Which one atom or ion in the following pairs has higher electron gain enthalpy?

(i) O- , S

(ii) O- , S-

(iii) N- , P

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(i) The electron gain enthalpy of O is positive while that of S is negative because of repulsions between the electrons on O- and the additional incoming electron.

(ii) Electron gain enthalpy of O is more positive than that of S- due to small size which causes repulsions between O- and the incoming electron is much more than in S-

(iii) The electron gain enthalpy of N is positive while that of P is negative because of repulsion between N- and the incoming electron.

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