Among the following statements, the incorrect one is

Options

A. Cassiterite ore of tin contains the impurities of Wolframite which are separated by electromagnetic separation.
B. Tin metal is obtained by the carbon reduction of black tin
C. In the extraction of lead from galena, the roasting and self-reduction are carried out in the same furnace at different temperature.
D. None of these

Answer

To determine which statement among the given options is incorrect, we will analyze each statement one by one based on our knowledge of metallurgy.

### Step 1: Analyze the first statement
**Statement 1:** "The cassiterite ore of tin contains the impurities of wolframite which are separated by electromagnetic separation."

- **Analysis:** Cassiterite (SnO2) is the primary ore of tin. It is non-magnetic, while wolframite (which contains tungsten, iron, and manganese) has magnetic properties. Therefore, the impurities in cassiterite can indeed be separated using electromagnetic separation.
- **Conclusion:** This statement is correct.

### Step 2: Analyze the second statement
**Statement 2:** "The tin metal is obtained by carbon reduction of black tin."

- **Analysis:** Black tin refers to tin oxide (SnO2) that has a high concentration of tin. The carbon reduction process involves the reaction:
\[ \text{SnO}_2 + 2\text{C} \rightarrow \text{Sn} + 2\text{CO} \]
This indicates that tin can be extracted from its oxide using carbon as a reducing agent.
- **Conclusion:** This statement is also correct.

### Step 3: Analyze the third statement
**Statement 3:** "In the extraction of lead from galena, the roasting and the self-reduction are carried out in the same furnace at the same temperature."

- **Analysis:** Galena (PbS) undergoes roasting in the presence of oxygen to form lead oxide (PbO) and sulfur dioxide (SO2). The process can be represented as:
\[ 2\text{PbS} + 3\text{O}_2 \rightarrow 2\text{PbO} + 2\text{SO}_2 \]
After roasting, self-reduction can occur where any remaining PbS reacts with PbO to produce lead metal. This process typically occurs in the same furnace but may not always be at the same temperature, depending on the specific conditions of the operation.
- **Conclusion:** This statement is generally accepted as correct, but it can be misleading regarding the temperature aspect.

### Step 4: Identify the incorrect statement
After analyzing all three statements, we find that:
- Statement 1 is correct.
- Statement 2 is correct.
- Statement 3 is correct, but it can be misleading regarding the temperature aspect.

However, the question asks for the incorrect statement, and since all statements are technically correct based on standard interpretations, we conclude that there is no incorrect statement among the options provided.

### Final Answer
None of the statements are incorrect.

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