Question

Heating of concentrated ore in absence of air, for conversion into oxide ore, is known as ____.

• A. roasting
• B. calcination
• C. reduction
• D. none of these

Answer 1

The correct option is B calcination

Calcination is the process of heating the ore strongly either in a limited supply of air or in the absence of air. Calcination helps to remove moisture, remove volatile impurities, make the ore porous, remove water from hydrated ores and decomposition of carbonates to oxides. Hydrated oxides and carbonate ores are calcinated to give oxides.
For example, $A{l}_2{O}_3.2H_{2}O\to A{l}_2{O}_3+2H_{2}O$