Write the names of the following compounds `:`
(i) `Al_(2) ( SO_(4))_(3)` (iii) ` Mg(HCO_(3))_(2)`
(iii) `(NH_(4))_(2)S` (iv) `KMnO_(4)`

Explanation

To write the names of the given compounds, we will analyze each chemical formula step by step.

### Step 1: Identify the first compound `Al₂(SO₄)₃`
- The formula consists of aluminum (Al) and sulfate (SO₄).
- There are 2 aluminum ions and 3 sulfate ions.
- The name of this compound is **Aluminum Sulfate**.

### Step 2: Identify the second compound `Mg(HCO₃)₂`
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