Indicate the types of isomerism exhibited by the following complexes :
(i) `[Co(NH_3)_5(NO_2)]^(2+)`
(ii) `[Co(en)_3]Cl_3` (en= ethylene diamine)
(iii) `[Pt(NH_3)_2Cl_2]`

Explanation

To determine the types of isomerism exhibited by the given complexes, we will analyze each complex one by one.

### Step-by-Step Solution:

#### (i) Complex: `[Co(NH_3)_5(NO_2)]^(2+)`

1. **Identify the Ligands**: The complex contains five ammonia (NH3) ligands and one nitro (NO2) ligand.
2. **Determine the Type of Isomerism**: The nitro ligand (NO2) can coordinate to the cobalt ion through either the nitrogen atom (forming a nitro ligand) or the oxygen atom (forming a nitrito ligand).
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