Question

An important source of copper is from the copper ore, chalcocite, a form of copper(I) sulfide. When heated, the Cu2S decomposes to form copper and sulfur described by the following equation:

a) Oxidation
b) Reduction
c) Combustion
d) Isomerization

Answer 1

The decomposition of Cu₂S to form copper and sulfur is an example of reduction (Option B).

Step-by-step explanation:

The extraction of copper from chalcocite involves several processes. Isolation of copper primarily involves the conversion of copper sulfides, like chalcocite (Cu₂S), into copper metal through heating. Initially, the concentrated sulfide ore is roasted to remove sulfur as sulfur dioxide.

After roasting, the remaining Cu₂S is mixed with other substances and subjected to further heating, which contribute to the formation of molten sl-ag, allowing impurities to be removed. During the production of copper, copper(I) sulfide (Cu₂S) is converted into copper(I) oxide (Cu₂O) by roasting in air. This Cu₂O is then reduced by the remaining Cu₂S to yield metallic copper, known as blister copper due to its characteristic appearance. Blister copper goes on to be further refined, often through electrolytic refining, to produce pure copper metal.

Thus, the correct option is B.