Question

In ______ ore is heated strongly in the absence of air.

Answer 1

In calcination ore is heated strongly in the absence of air.

Explanation:

Calcination is a metallurgical process primarily used for carbonate or hydrated ores, where the concentrated ore is heated to high temperatures below its melting point either in the complete absence or a limited supply of air. This thermal treatment decomposes the ore, expelling volatile impurities and moisture while converting metal carbonates into metal oxides. For example, heating zinc carbonate (ZnCO₃) yields zinc oxide (ZnO) and releases carbon dioxide gas (CO₂).