A) \[Cl+{{e}^{-}}\xrightarrow{{}}C{{l}^{-}}\]
B) \[{{O}^{-}}+{{e}^{-}}\xrightarrow{{}}{{O}^{2-}}\]
C) \[O+{{e}^{-}}\xrightarrow{{}}{{O}^{-}}\]
D) \[S+{{e}^{-}}\xrightarrow{{}}{{S}^{-}}\]
Correct Answer: B
Solution :
Most of the atoms have a natural tendency to accept an electron, so energy is released when first electron is added. But when a second electron is added to an atom of small size, the added electron experience greater repulsion from the previous one. To overcome this repulsion and to push in second electron, the energy has to supplied. Thus, the process, \[{{O}^{-}}+{{e}^{-}}\xrightarrow{{}}{{O}^{2-}}\] involves absorption of energy.
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