$(i)\,Cl\xrightarrow{E.A.}Cl^-\,\,\,\,\,\,(ii)\,C{{l}^{-}}\xrightarrow{I.E.}Cl\,\,\,\,(iii)\,\,Cl\xrightarrow{I.E.}C{{l}^{+}}\,\,\,(iv)\,\,C{{l}^{+}}\xrightarrow{I.E.}Cl^{2+}$
${{O}^{-}}_{\left( g \right)}+{{e}^{-}}\to O_{\left( g \right)}^{2-};\Delta {{H}^{o}}=844\,kJ\,mo{{l}^{-1}}$
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