Question

Name the process of heating of an ore in the absence of air below its melting point.

• A. Roasting
• B. Oxidation
• C. Auto-reduction
• D. Calcination

Answer 1

The correct option is D Calcination

• Roasting is the process in which the ore is heated to high temperatures in an excess supply of air (oxygen).
• Oxidation is the chemical process in which a substance

1. Gains oxygen
2. Gains an electronegative element
3. Loses electron(s)
4. Loses hydrogen
5. Loses an electropositive element.

• Auto reduction is the process in which sulphide ores of less electropositive metals like Cu, Hg, Pb are heated in the presence of air.
• Calcination is the process in which the ore of the metal is heated to high temperatures in the absence or limited supply of air (oxygen).