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# The formation of $O^{2-}(g)$ starting from $O(g)$ is endothermic by $603\;kjmol^{-1}$ .If electron affinity of O is$-141\;kjmol^{-1}$, the second electron affinity of oxygen would be :

$(a)\;+744\;kjmol^{-1} \\(b)\;-744 kjmol^{-1} \\ (c)\;+462\;kjmol^{-} \\ (d)\;-462\;kjmol^{-1}$

The second electron affinity of oxygen would be $+744\;kjmol^{-1}$
Hence a is the correct answer.