Name the very poisonous gas produced by the incomplete combustion of fuels.

Explanation

**Step-by-Step Solution:**

1. **Understanding Combustion:**
- Combustion is a chemical process where a substance (usually a fuel) reacts with oxygen to produce heat and light. There are two types of combustion: complete and incomplete.

2. **Complete vs. Incomplete Combustion:**
- In complete combustion, there is a sufficient supply of oxygen, resulting in the production of carbon dioxide (CO₂) and water (H₂O).
- In incomplete combustion, there is an insufficient supply of oxygen, leading to the formation of carbon monoxide (CO) along with other products.
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