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Which of the following is not an ambidentate ligand?
A
$C_2O_4^{2-}$
B
$SCN^-$
C
$NO_2^-$
D
$CN^-$
Detailed Solution
Ambidentate ligands have two different donor atoms, either of which can bind to the metal. $SCN^-$ (S or N), $NO_2^-$ (N or O) and $CN^-$ (C or N) are ambidentate. $C_2O_4^{2-}$ (oxalate) binds only through its oxygen atoms (as a bidentate ligand) and has only one type of donor site, so it is not ambidentate.