Using Stock notation , represent the following compounds , `H AuCl_(4) , Tl_(2)O , FeO , Fe_(2)O_(3) , Cul , CuO , MnO ` and `MnO_(2)` .

Explanation

To represent the given compounds using Stock notation, we need to determine the oxidation states of the metals in each compound and then write the metal symbol followed by its oxidation state in Roman numerals. Here’s a step-by-step solution:

### Step 1: Determine the oxidation states of each metal in the compounds.

1. **HAuCl₄**:
- Chlorine (Cl) has an oxidation state of -1.
- There are 4 Cl atoms, contributing a total of -4.
- To balance this with hydrogen (H) which has +1, the oxidation state of gold (Au) must be +3.
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