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