1.

Explain [Co(NH_(3))_(6)]^(3+) is an inner orbital complex whereas [Ni(NH_(3))_(6)]^(2+) is an outer orbital complex.

Answer»

Solution :In `[Co(NH_(3))_(6)]^(3+)`, oxidation STATE of `Co=+3`
Electronic CONFIGURATION `=3d^(6)`
In presence of `NH_(3)`, `3d` electrons pair up leaving two `d`-orbitals empty. HENCE , the hybridisation is `d^(2)sp^(3)` forming an inner orbital complex.
In `[Ni(NH_(3))_(6)]^(2+)`
Oxidation state `=+2`, Electronic Configuration `=3d^(8)`. In the presence of `NH_(3)`, `3d` electrons do not pair up. The hybridisation involved is `sp^(3)d^(2)` and it forms an outer orbital complex.


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