A) \[{{\text{O}}^{-}}\]is formed from O
B) \[{{\text{O}}^{2-}}\]is formed from \[{{\text{O}}^{-}}\]
C) \[{{\text{O}}^{+}}\]is formed from O
D) \[{{\text{O}}^{3-}}\]is formed from \[{{\text{O}}^{-}}\]
Correct Answer: B
Solution :
Electron affinity is the amount of energy released or absorbed when an electron is added to an atom. Since every atom has a natural tendency of accepting an electron, the first electron affinity ries electron affinity for formation of\[{{\text{O}}^{-}}\]from O is negative. But when the second electron is added to the negatively charged ion, the incoming electron experience greater repulsion due to smaller size of O atom. Thus, energy has to supplied for pushing in the second electron and second EA for O atom ie, electron affinity for the formation of\[{{\text{O}}^{-2}}\] from\[{{\text{O}}^{-}}\] is positive. Formation of \[\text{O}_{3}^{-}\]is not possible due to small size of O atom.
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