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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