1.

Give the formula of each of the following coordination entities : Co^(3+) ion is bound to one Cl^(-), one NH_(3) molecule and two bidentate ethylene diamine (en) molecules.

Answer»

Solution :`Co^(3+)+1Cl^(-) + 1NH_(3) + 2` ETHYLENE diammine
`[CoClNH_(3)(H_(2)NCH_(2)CH_(2)NH_(2))_(2)]^(2+)`
Name: Amminechloridobis (ethane-1, 2-diammine) cobalt(III) ion.
The electronic CONFIGURATION of `Co^(3+)` in 3d ORBITAL is

In the presence of the ligands NH3 and en, pairing of ELECTRONS will take place as under and `d^(2)sp^(3)` hybridisation takes place giving rise to octahedral shape

As there are no unpaired electrons, the complex ion will be diamagnetic.


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