Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like `CH_4` ). This process X is called ________ and the metal contains impurities of Y is __________ .

Options

A. X=cupellation, `Y=CuO_(2)`
B. X=polling, `Y=Cu_(2)O`
C. X=polling, Y= CuO
D. X=cupellation, Y=CuO

Answer

To solve the question, we need to identify two key components: the name of the refining process (X) and the type of impurities (Y) present in blister copper.

### Step-by-Step Solution:

1. **Understanding Blister Copper**:
- Blister copper is an intermediate product obtained during the smelting of copper ores. It contains a significant amount of impurities, primarily copper oxides.

2. **Refining Process**:
- The refining of blister copper involves stirring molten impure copper with green logs of wood. The green wood releases hydrocarbon gases, such as methane (CH₄), when burned.
- These hydrocarbon gases act as reducing agents, which help in the reduction of copper oxides present in the blister copper.

3. **Identifying the Process**:
- The process of refining blister copper by stirring with green wood is known as **"coaling"**. This name comes from the fact that the wood is used to produce gases that facilitate the reduction of metal oxides.

4. **Identifying the Impurities**:
- The primary impurity found in blister copper is **copper(I) oxide**, which is represented chemically as **Cu₂O**. This oxide is reduced to pure copper during the refining process.

### Final Answer:
- The process X is called **"coaling"**.
- The metal contains impurities of Y is **"Cu₂O"**.