Calcination of iron ores is done A. To remove moisture B. To remove carbonic acid C. By roasting in heaps D. All the above

The correct answer is D. All of the above.

Calcination is a process of heating a material to a high temperature in order to drive off volatile components, such as water, carbon dioxide, and other gases. This process is used to convert iron ores into a form that

The main purpose of calcination is to remove moisture from the ore. This is because water can interfere with the smelting process, making it more difficult to extract the iron from the ore. Calcination also removes carbonic acid from the ore, which can also interfere with the smelting process.

Calcination is typically done by roasting the ore in heaps. This involves heating the ore in a pile, without using a furnace. The heat from the fire causes the water and carbon

Calcination is an important step in the production of iron. It helps to improve the quality of the iron and makes it easier to extract from the ore.