Minerals from which metals can be extracted economically and easily are called ores.The extraction of metals from theirs ores involves the following processes.
(i)Concentration.
(ii)Calcination | roasting | leaching .
(iii)Reduction.
It is carried out be one of the following methods.
Which of the following is not correctly matched ?

Options

A. Red bauxite - Purification by Serpeck's method
B. Iron from haematite - Carbon monoxide reduction
C. Calamine - Carbonate ore
D. `FeSiO_3` - Slag obtained in the extraction of copper

Explanation

To solve the question regarding the extraction of metals from ores and identify which of the following is not correctly matched, we will analyze each option provided in the context of the extraction processes mentioned in the question.

### Step-by-Step Solution:

1. **Understanding Ores and Extraction Processes**:
- Ores are minerals from which metals can be extracted economically and easily.
- The extraction of metals involves several processes: concentration, calcination, roasting, leaching, and reduction.

2. **Analyzing the Options**:
- We need to evaluate each option to determine if the extraction method is correctly matched with the ore.

3. **Option 1: Red Bauxite Purification by the Serpux Method**:
- Red bauxite contains impurities such as iron oxide, titanium oxide, and silica.
- The Serpux method is specifically used for bauxite that primarily contains silica as an impurity.
- Therefore, this option is **not correctly matched** because red bauxite is not purified by the Serpux method.

4. **Option 2: Iron from Hematite by Carbon Monoxide Reduction**:
- Hematite (Fe2O3) can be reduced to iron using carbon monoxide (CO).
- The reaction is valid and correctly describes the process of extracting iron from hematite.
- This option is **correctly matched**.

5. **Option 3: Calamine for Carbonate Ore**:
- Calamine is zinc carbonate (ZnCO3).
- The extraction of zinc from calamine involves heating it to produce zinc oxide and carbon dioxide.
- This option is **correctly matched**.

6. **Option 4: FeSiO3 Slag Obtained in the Extraction of Copper**:
- During the extraction of copper, iron oxide (FeO) and silica (SiO2) react to form FeSiO3, which is the slag.
- This option is also **correctly matched**.

7. **Conclusion**:
- After analyzing all options, the only option that is not correctly matched is **Red Bauxite Purification by the Serpux Method**.

### Final Answer:
**Red Bauxite Purification by the Serpux Method** is not correctly matched.

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