When the first electron gain enthalpy
Question:

When the first electron gain enthalpy $\left(\Delta_{\text {eg }} \mathrm{H}\right)$ of oxygen is $-141 \mathrm{~kJ} / \mathrm{mol}$, its second electron gain enthalpy is :

  1. almost the same as that of the first

  2. negative, but less negative than the first

  3. a positive value

  4. a more negative value than the first


Correct Option: , 3

Solution:

Second electron gain enthalpy is always positive for every element.

$\mathrm{O}_{(\mathrm{g})}^{-}+\mathrm{e}^{-} \rightarrow \mathrm{O}_{(\mathrm{g})}^{-2} \quad ; \Delta \mathrm{H}=$ positive

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