1.

Which of the following is most easily oxidised ?

Answer»

`[Co(CN)_(6)]^(4-)`
`[Co(NO_(2))_(6)]^(3-)`
`[Co(NH_(3))_(6)]^(2+)`
`[Co(en)_(3)]^(2+)`

Solution :`[Co(CN)_(6)]^(4-):Co^(2+):3D^(7)`

`overset(Ө)CN` is strong FIELD ligand among all GIVEN ligands hence `[Co(CN)_(6)]^(4-)` is easily oxidised into `[Co(CN)_(6)]^(3-)`.


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