______ is a non-metal but is lustrous.

Options

A. Carbon
B. Sulphur
C. iodine
D. bromine

Explanation

To solve the question "______ is a non-metal but is lustrous," we will analyze the options provided and identify the correct answer based on the properties of non-metals.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify a non-metal that has a shiny appearance, which is referred to as "lustrous."

2. **Analyzing the Options**:
- **A. Carbon**: Carbon is a non-metal, but it is generally not lustrous. It appears in forms like graphite (which is somewhat shiny) and diamond (which is shiny), but as a general non-metal, it is not considered lustrous.
- **B. Sulphur**: Sulphur is a non-metal and has a dull appearance. It is not lustrous.
- **C. Iodine**: Iodine is a non-metal that is known to have a shiny, lustrous appearance in its solid form. This makes it an exception among non-metals.
- **D. Bromine**: Bromine is a non-metal that is liquid at room temperature and has a reddish-brown color, but it is not considered lustrous.

3. **Identifying the Correct Answer**:
- Among the options, **C. Iodine** stands out as the non-metal that is lustrous.

4. **Conclusion**:
- Therefore, the answer to the question is **Iodine**.

### Final Answer:
Iodine is a non-metal but is lustrous.

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