Which substance give heat and light after combustion?

Options

A. Flame
B. Fuel
C. Combustion
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for a substance that produces heat and light when it undergoes combustion.

2. **Defining Combustion:**
Combustion is a chemical process where a substance reacts with oxygen, resulting in the release of energy in the form of heat and light.

3. **Identifying the Substance:**
The substances that undergo combustion are typically known as fuels. Fuels can be in various forms such as solids (like wood), liquids (like gasoline), or gases (like methane).

4. **Example of a Fuel:**
One common example of a fuel is methane (CH4). When methane combusts in the presence of oxygen, it produces carbon dioxide (CO2), water (H2O), and energy in the form of heat and light.

5. **Conclusion:**
Therefore, the substance that gives heat and light after combustion is a fuel, such as methane.

**Final Answer:**
The substance that gives heat and light after combustion is a fuel, for example, methane (CH4).

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