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Correct order of bond length is

$(a)\;CO_3^{2-} > CO_2 > CO \\ (b)\;CO_2 > CO > CO_3^{2-} \\(c)\;CO > CO_2 > CO_3^{2-} \\(d)\;\text{none of these} $

1 Answer

From Valence bond theory , bond order of $CO$ ie $:C \equiv O:$
is 3, that of $O= C =O$ is 2 while that of $CO_3^{2-}$ ion is $1.33$
Since the bond length increases s the bond order decreases, so the order is $CO < CO_2 < CO_3^{2-}$
Hence a is the correct answer.
answered Apr 1, 2014 by meena.p

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