Question

Given below are the steps for extraction of Copper from its
ore. Write the reactions involved.
(a) Roasting of Copper (1) Sulphide
(b) Reduction of Copper (1) Oxide with Copper (1) Sulphide
(c) Electrolytic Refining
Draw a neat and well labelled diagram for Electrolytic refining.
OR
for the​

Answer 1

Answer:

a. Roasting:

Roasting is the process by which sulphide ores are concentrated. The sulphides ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting. The reaction is given below:

2ZnS + 3O2 + Heat → 2ZnO + 2SO2

b. Calcination:

The carbonates ores are changed into oxides by heating strongly in the presence of excess air. This process is known as calcination. The reaction is given below:

ZnCO3 + Heat → ZnO + 2CO2

c. Electrolytic refining:

Many metals such as copper, zinc, silver, gold, copper are refined electrolytically. For example:

At cathode: Cu2+ + 2e-→ Cu

At anode: Cu → Cu2+ + 2e-