The metal that is not extracted from its sulphide ore is

We need to identify which metal is not extracted from its sulphide ore.

Let us examine each option:

Option A: Aluminium

Aluminium is primarily extracted from bauxite ($$Al_2O_3 \cdot 2H_2O$$), which is an oxide ore, not a sulphide ore. The extraction is done by the Bayer's process followed by the Hall-Heroult electrolytic process.

Option B: Iron

While iron is commonly extracted from oxide ores like haematite ($$Fe_2O_3$$), iron pyrite ($$FeS_2$$) is a sulphide ore of iron. However, iron pyrite is mainly used for making sulphuric acid rather than extracting iron. Nevertheless, iron can be associated with sulphide ores.

Option C: Lead

Lead is extracted from its sulphide ore galena ($$PbS$$). The ore is roasted to convert it to $$PbO$$ and then reduced with carbon.

Option D: Zinc

Zinc is extracted from its sulphide ore zinc blende ($$ZnS$$). The ore is roasted to form $$ZnO$$ and then reduced with carbon.

Aluminium does not have any commercially important sulphide ore. It is always extracted from its oxide ore (bauxite).

Therefore, the correct answer is Option A: Aluminium.