Copper is extracted from sulphide ore using the method :

Options

A. carbon reduction
B. carbon monoxide reduction
C. auto reduction
D. None of these

Answer

To answer the question about how copper is extracted from sulphide ores, we will follow these steps:

### Step 1: Identify the Ore
Copper is primarily found in nature in the form of sulphide ores, such as chalcopyrite (CuFeS₂) and chalcocite (Cu₂S).

**Hint:** Look for the common sulphide ores of copper.

### Step 2: Understand the Extraction Method
The extraction of copper from its sulphide ores is primarily done through a process known as auto-reduction or self-reduction. This method involves heating the ore in the absence of a reducing agent.

**Hint:** Consider methods that involve heating the ore directly without additional reducing agents.

### Step 3: Describe the Chemical Reaction
During the auto-reduction process, the copper sulphide (Cu₂S) is heated in the presence of oxygen. The reaction can be represented as follows:

\[ 2Cu_2S + 3O_2 \rightarrow 4Cu + 2SO_2 \]

In this reaction, copper sulphide is oxidized to form copper metal and sulfur dioxide gas.

**Hint:** Think about the products formed when sulphide ores are heated with oxygen.

### Step 4: Analyze the Oxidation States
In the reaction, the oxidation state of copper changes from +1 in copper sulphide (Cu₂S) to 0 in elemental copper (Cu). This indicates that copper is being reduced.

**Hint:** Review how oxidation states change during reduction and oxidation reactions.

### Step 5: Conclusion
Based on the above steps, we conclude that copper is extracted from sulphide ores using the auto-reduction method.

**Hint:** Remember to summarize the key points to reinforce your understanding.

### Final Answer
Copper is extracted from sulphide ores using the method of auto-reduction.