Amongst the following, the most stable complex is :
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a
CoH2O63+
b
Co(ox)33−
c
Co(ONO)63−
d
CoF63−
answer is B.
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Detailed Solution
Stability order : Co(ox)33−>CoH2O63+>Co(ONO)63−>CoF63−For a given metal cation and fixed co-ordination number, 5 or 6 membered chelated complex is found to be more stable than complex with monodentate ligand.