Which of the following is chalcopyrite?

Options

A. `CuFeS_2`
B. `FeS_2`
C. `kMgCl_36H_2O`
D. `Al_2O_32H_2O`

Answer

To determine which of the following is chalcopyrite, we first need to understand what chalcopyrite is.

### Step-by-Step Solution:

1. **Definition of Chalcopyrite**: Chalcopyrite is a mineral that is primarily composed of copper, iron, and sulfur. Its chemical formula is CuFeS₂, which indicates that it contains copper (Cu), iron (Fe), and sulfur (S) in a specific ratio.

2. **Identifying the Chemical Formula**: To identify chalcopyrite among the given options, we need to look for the chemical formula CuFeS₂. This formula signifies that the mineral is a sulfide ore containing both copper and iron.

3. **Analyzing the Options**: We will analyze the options provided to see which one matches the chemical composition of chalcopyrite:
- If one of the options is CuFeS₂, that would be the correct answer.
- Other options may include different minerals or ores, such as halides or oxides, which do not contain the combination of copper, iron, and sulfur.

4. **Conclusion**: After analyzing the options, the one that corresponds to the formula CuFeS₂ is identified as chalcopyrite.

### Final Answer:
The correct option that represents chalcopyrite is **CuFeS₂**.

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