Write down the formulae of the following coordination compounds :
(i) hexaaquairon (II) sulphate (ii) potassium tetracyanonickelate (III)
(iii) chloronitrodiammineplatinum (II) (iv) potassium hexacyanoferrate (III)
(v) chlorodiammineplatinum (II) ion (vi) dichlorotetraamminecobalt (III) ion
(vii) potassium pentacyanonitrosylcobaltate (III) (viii) bis(acetylacetonato) oxovanadium (IV).

Explanation

To write the formulae of the given coordination compounds, we will follow the systematic approach of identifying the central metal ion, the ligands, and their respective counts. Below is the step-by-step solution for each compound:

### Step-by-Step Solution:

1. **Hexaaquairon (II) sulphate**
- Identify the central metal: Iron (Fe)
- Identify the ligands: Hexa (6) aqua (H2O)
- Identify the counter ion: Sulphate (SO4^2-)
...