Coal is mainly carbon, also having some other elements like

Options

A. oxygen, hydrogen, nitrogen and sulphur
B. chlorine, nitrogen, sulphur and helium
C. sulphur, phosphorus, iodine and oxygen
D. bromine, nitrogen, phosphorus and hydrogen.

Explanation

**Step-by-Step Solution:**

1. **Understanding Coal Composition**: Coal is primarily composed of carbon, which is the main element that defines its characteristics and combustibility.

2. **Identifying Other Elements**: In addition to carbon, coal contains several other elements. These elements can vary depending on the type of coal and its formation process.

3. **Listing Common Elements Found in Coal**:
- **Hydrogen**: Present in coal, contributing to its energy content.
- **Oxygen**: Also found in coal, it can affect the combustion properties.
- **Nitrogen**: Present in small amounts, it can influence the emission of pollutants during combustion.
- **Sulfur**: Found in varying amounts, it can lead to the production of sulfur dioxide when coal is burned, which is a pollutant.
- **Ash**: This is the inorganic residue left after combustion and contains minerals.
- **Chlorine and Sodium**: These are considered undesirable elements that can affect the quality of coal.

4. **Elements Not Present in Coal**: Elements such as helium, iodine, phosphorus, and bromine are not typically found in coal.

5. **Conclusion**: Therefore, the elements that are mainly found in coal, besides carbon, include hydrogen, oxygen, nitrogen, sulfur, and ash.

**Final Answer**: Coal is mainly carbon and also contains hydrogen, oxygen, nitrogen, sulfur, and ash.

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