What are the disadvantages of incomplete combustion?

Explanation

### Step-by-Step Text Solution

1. **Definition of Incomplete Combustion**: Incomplete combustion occurs when there is not enough oxygen present for a fuel to react completely, resulting in the production of various byproducts instead of just carbon dioxide and water.

2. **Formation of Unburnt Carbon**: One of the primary disadvantages of incomplete combustion is the formation of unburnt carbon. This unburnt carbon is released into the atmosphere in the form of soot.

3. **Environmental Impact**: The soot that is released contributes to air pollution. It can settle on surfaces, leading to environmental degradation and health issues for living organisms.

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