A) O changes into \[{{\text{O}}^{-}}\]
B) \[{{\text{O}}^{-}}\]changes into \[{{\text{O}}^{2-}}\]
C) O changes into \[{{\text{O}}^{+}}\]
D) electron affinity is always negative
Correct Answer: B
Solution :
Electron affinity is the energy change, when an electron is added. When \[{{\text{O}}^{-}}\] changes into \[{{\text{O}}^{2-}},\] the electron affinity is positive i.e., change is endothermic. The reason is that \[{{\text{O}}^{-}}\] repels the incoming electron due to similar charge, hence it needs energy to accept the electron. Hence electron affinity is positive.You need to login to perform this action.
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