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a
ONO-
b
SCN-
c
C2O4-2
d
CN-
answer is C.
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Detailed Solution
A) NO2-, ONO-; B) CN-, NC- ; C) SCN-, NCS- ; These are ambidentate ligands; But oxalato is not a ambidentate ligand; A ligand which contains two donar atoms but at a time only one atom donates is an ambidentate ligand; In oxalato, both oxygen atoms can donate simultaneously;