1.

In which of the following complexes of the Co (At. no. 27), will the magnitude of Delta_(a) be the highest ?

Answer»

`[Co(CN)_(6)]^(3-)`
`[Co(C_(2)O_(4))_(3)]^(3-)`
`[Co(H_(2)O)_(6)]^(3+)`
`[Co(NH_(3))_(6)]^(3+)`

Solution :In OCTAHEDRAL COMPLEX the magnitude of `Delta_(a)` will be HIGHEST in a complex having strongest LIGAND. Out of the given ligands `CN^(-)` is strongest. So, `Delta_(a)` will be highest for `[Co(CN)_(6)]^(3-)`. Thus option (a) is correct.


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