Roasting process is used for:

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${CuFeS}_{2}$

$ZnS$

impure ${Fe}_{2} O_{3}$

all of these

answer is D.

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Detailed Solution

The roasting process is used for impure ${Fe}_{2} O_{3}$ , ${CuFeS}_{2}$ , $ZnS$ .

Sulphide ore is heated to a high temperature while being exposed to air in the roasting process. It is a stage in the processing of certain ores. More precisely, roasting is frequently a metallurgical process that involves gas-solid interactions at high temperatures to purify the metal component (s).

Hence, option D is correct

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