A) a positive value
B) a more negative value than the first
C) almost the same as that of the first
D) negative, but less negative than the first
Correct Answer: A
Solution :
Second elecrtron gain enthalpy is always positive for every element due to repulsion between some charge. \[O\left( g \right)+\,\,1{{e}^{-}}\,\,\to \,\,{{e}^{-}}\left( g \right)\text{ }\Delta {{H}_{e{{g}^{-}}}}-141\text{ }kJ/mol\] \[{{O}^{-}}(g)+1{{e}^{-}}\to {{O}^{-2}}(g)\,\,\Delta H=\oplus ve\]You need to login to perform this action.
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