Statement-I: Energy is released when O-atom gains one electron but energy is absorbed when $2^{nd}$ electron is gained.
Statement-II: $2^{nd}$ electron gain enthalpy is -ve and first is +ve

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Both Statement-I and Statement-II are correct

Statement-I is correct and Statement-II is incorrect

Statement-I is incorrect and Statement-II is correct

Both statement-I and Statement-II are incorrect

answer is B.

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Detailed Solution

1^st electron gain enthalphy is -ve and 2^ndelectron gain enthalphy is +ve due to inter elctronic repulsions between uni -ve ion and addition of 2^nd electron

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