Write the formulas for the following coordination compounds :
(1) Diamminesilver (I) chloride
(2) Potassiumtetraiodomercurate(II)
(3) Iron(III) hexacyanoferrate(II)
(4) Amminebromidochloridonitrito-N-platinate(II)

Explanation

To write the formulas for the given coordination compounds, we need to analyze each name carefully, identifying the ligands, the central metal ion, and its oxidation state. Let's break it down step by step.

### Step 1: Diamminesilver(I) chloride
1. **Identify the ligands**: "Diamine" indicates two ammonia (NH₃) ligands.
2. **Identify the metal and its oxidation state**: "Silver(I)" indicates silver (Ag) with an oxidation state of +1.
3. **Identify the counter ion**: "Chloride" indicates Cl⁻.
4. **Construct the formula**: The coordination complex will be [Ag(NH₃)₂]⁺ for the cation, and Cl⁻ will be outside the coordination sphere.
5. **Final formula**: The overall formula is **[Ag(NH₃)₂]Cl**.
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