The main purpose of roasting and calcination is to convert:

ore into metal

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ore into metallic carbonate

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ore into oxides

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ore into sulphide

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Solution

The correct option is C ore into oxides
Usually metals are obtained from oxide ores after going through reduction or electrolysis process. While oxide ores are easy to reduce it is not the same with sulphides and carbonates. These ores can be turned to metals only after converting carbonates and sulphides to an oxide ore.

Thus, for this purpose, the conversion is mostly done through the processes of calcination or roasting.

Example for calcination:

CaCO $_{3}$ $\to$ CaO + CO $_{2}$

Example for roasting:

2ZnS+3O $_{2}$ $\to$ 2ZnO + CO $_{2}$

Hence, C is the correct option.

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Similar questions

Sulphide ore is converted into pure metal (say $C u$ ) by following steps.

Bessemerisation $\to$ Roasting $\to$ Electrolysis

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