Question

Math the following pair

• A. Presence of air
• B. Absence of air
• C. Oxidation
• D. Reduction

Answer 1

Anode undergo loss of electrons results in oxidation process.
Cathode undergo gain of electrons results in reduction process.
Calcination is for carbonate ore carried out in the absence or limited supply of air.
Roasting is for sulphide ore carried out in the excess supply of air.