Why is combustion reaction an oxidation reaction?

Explanation

### Step-by-Step Solution:

1. **Definition of Oxidation Reaction**:
- An oxidation reaction is defined as a chemical reaction where there is a gain of oxygen or a loss of hydrogen.

2. **Understanding Combustion**:
- Combustion is a chemical reaction that occurs when a substance (usually a hydrocarbon) reacts with oxygen, producing heat and light.

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