Determine the oxidation states of central metal ions in the following complex compounds :
(i) (a) `K_(4)[Fe(CN)_(6)]` (b) `[Co(NH_(3))_(6)]Cl_(3)`
(ii) (a) `K_(3)[Fe(CN)_(6)]` (b) `[PtCl_(4)]^(2-)` (c ) `[CoBr_(2)(CN)_(2)]^(+)`
(iii) (a) `[Pt(NH_(3))_(3)Cl_(3)]` ion (b) `Na_(4)[Ni(CN)_(4)]` (c ) `[Zn(H_(2)O)_(3)OH]^(+)`

Explanation

To determine the oxidation states of the central metal ions in the given complex compounds, we will follow a systematic approach. Below is the step-by-step solution for each part of the question.

### (i)
#### (a) `K_(4)[Fe(CN)_(6)]`
1. Identify the oxidation state of potassium (K). Potassium is an alkali metal and has an oxidation state of +1.
2. The cyanide ion (CN) is a ligand with an oxidation state of -1.
3. The overall charge of the complex ion `[Fe(CN)_(6)]` is neutral (0).
4. Set up the equation:
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