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Which one of the following is the correct order of decreasing bond enthalpies for the given species?

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N₂>O₂>O₂^2->O₂^-

O₂>N₂>O₂^->O₂^2-

N₂>O₂>O₂^->O₂^2-

O₂^2->O₂^->N₂>O₂

answer is B.

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Detailed Solution

Bond order α Bond enthalpies.
More the bond order, more is bond energy or bond enthalpy.
$O_{2}^{2 -} = (B.O. = 1) < O_{2}^{-} = (B.O. = 1.5) < O_{2} = (B.O. = 2) < N_{2} = (B.O. = 3)$

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