Question

the reduction
of metal oxide by carbon and carbon monoxide to the metal is called
() calcination
(ii) lavigation
(iii) roasting
(iv) smelting​

Answer 1

Explanation:

I think smelting. I hope it may help you

Answer 2

Answer:

Now we already saw how the ore of a metal is concentrated to remove impurities known as gangue. After concentration of ores, we must now extract metal from in it. This step will give us metal in its pure form i.e. the native form of metal.

1)Calcination :

This is the process of heating a substance in a limited supply of air or oxygen. We subject the ore to thermal energy (heat) so we can change their chemical state and turn them into oxides. Although we must ensure that we keep the temperatures below the melting point of the metal. Hydroxides and carbonates are usually converted to oxides via this process. Here is how an iron ore is converted to iron oxide, to then later enable reduction

Fe2O3.xH2O → Fe2O3 (solid) + H2O (gas)

2] Roasting

Roasting is another way to convert compounds to oxides. It is a metallurgical process involving gas-solid reactions at elevated temperatures with the goal of purifying the metal component. In roasting the ore is heated up in the furnace in a regular supply of air. Again we ensure that the temperatures are within the melting point of the metal.

Smelting:

Pyrometallurgy, extraction and purification of metals by processes involving the application of heat. The most important operations are roasting, smelting, and refining. Roasting, or heating in air without fusion, transforms sulfide ores into oxides, the sulfur escaping as sulfur dioxide, a gas.