During extraction of iron from haematite, the slag formed consists of ............while the slag formed during extraction of copper from copper pyrites consists of ............. .

Answer

To answer the question regarding the composition of slag formed during the extraction of iron from hematite and copper from copper pyrites, we can break it down into the following steps:

### Step 1: Understanding the Extraction of Iron from Hematite
- Hematite (Fe₂O₃) is an iron ore that is reduced in a blast furnace to extract iron. The process involves the reduction of iron oxide using carbon (coke) and the formation of slag.

### Step 2: Identifying the Components of Slag in Iron Extraction
- During the extraction of iron, impurities such as silica (SiO₂) are present in the ore. To remove these impurities, a flux (usually limestone, CaCO₃) is added.
- The limestone decomposes to form calcium oxide (CaO), which reacts with silica to form calcium silicate (CaSiO₃), the main component of slag.

### Step 3: Understanding the Extraction of Copper from Copper Pyrites
- Copper pyrites (CuFeS₂) is an ore from which copper is extracted. The process involves roasting the ore to convert it into copper(I) sulfide (Cu₂S) and iron(II) sulfide (FeS).

### Step 4: Identifying the Components of Slag in Copper Extraction
- Similar to iron extraction, a flux is also used in copper extraction. In this case, silica (SiO₂) is used as a flux to remove impurities.
- The iron sulfide (FeS) formed during the roasting reacts with silica to produce iron silicate (FeSiO₃), which forms the slag.

### Final Answer
- Therefore, the slag formed during the extraction of iron from hematite consists of **calcium silicate (CaSiO₃)**, while the slag formed during the extraction of copper from copper pyrites consists of **iron silicate (FeSiO₃)**.