Q.

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.
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