find out total number of coloured/black water insoluble compound(s) from following substances:
`Ag_(2)O,HgI_(2),FeS, Ag_(3)PO_(4),Ba(MnO_(4))_(2),Na_(2)CrO_(4),PbI_(2),AgNO_(2),Ag_(2)C_(2)O_(4)`

Explanation

To find the total number of colored or black water-insoluble compounds from the given substances, we will analyze each compound based on its color and solubility.

### Step-by-Step Solution:

1. **Identify the Compounds:**
The given compounds are:
- Ag₂O
- HgI₂
- FeS
- Ag₃PO₄
- Ba(MnO₄)₂
- Na₂CrO₄
- PbI₂
- AgNO₂
- Ag₂C₂O₄

2. **Analyze Each Compound:**
- **Ag₂O:** This compound is black in color and is insoluble in water.
- **HgI₂:** This compound forms a red-colored precipitate and is insoluble in water.
- **FeS:** This compound is black in color and is insoluble in water.
- **Ag₃PO₄:** This compound is yellow in color and is insoluble in water.
- **Ba(MnO₄)₂:** This compound is a violet-colored soluble solution, so it does not count.
- **Na₂CrO₄:** This compound is a yellow-colored solution, so it does not count.
- **PbI₂:** This compound is a yellow-colored precipitate and is insoluble in water.
- **AgNO₂:** This compound forms a colorless precipitate, so it does not count.
- **Ag₂C₂O₄:** This compound forms a white precipitate, so it does not count.

3. **Count the Valid Compounds:**
The compounds that are either colored or black and insoluble in water are:
- Ag₂O (black)
- HgI₂ (red)
- FeS (black)
- Ag₃PO₄ (yellow)
- PbI₂ (yellow)

Total valid compounds = 5

### Final Answer:
The total number of colored or black water-insoluble compounds is **5**.

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