______ is an excellent supporter of combustion.

Options

A. Oxygen
B. Water
C. Nitrogen
D. Hydrocarbons

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for a substance that is an excellent supporter of combustion. This means we need to identify a substance that helps in the process of burning but does not burn itself.

**Hint:** Think about what substances are known to aid in combustion without being consumed in the process.

2. **Defining Supporter of Combustion:**
A supporter of combustion is a substance that facilitates combustion. It provides the necessary oxygen or environment for a fire to occur but does not participate in the burning process itself.

**Hint:** Recall the role of oxygen in combustion processes.

3. **Identifying Examples:**
Common examples of supporters of combustion include gases that provide oxygen. The most well-known supporter of combustion is oxygen (O₂).

**Hint:** Consider what gases are present in the air and their roles in combustion.

4. **Analyzing Other Options:**
- **Water (H₂O):** Water is known to extinguish fires and does not support combustion.
- **Nitrogen (N₂):** Nitrogen is inert and does not support combustion; it can dilute oxygen but does not burn itself.
- **Hydrocarbons:** These are fuels that burn themselves and do not support combustion.

**Hint:** Think about the chemical properties of these substances and their interactions with fire.

5. **Conclusion:**
The only substance from the options that is an excellent supporter of combustion is oxygen. Therefore, the answer to the question is:

**Answer:** Oxygen