Out of ${Cu}_{2} S, HgS, {Ag}_{2} S, PbS$ and $ZnS$ , roasting will convert the minerals into metal in case of :

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$HgS, ZnS$

${Cu}_{2} S, {Ag}_{2} S$

${Cu}_{2} S, PbS$

$HgS, {Cu}_{2} S$

answer is A, C, D.

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Detailed Solution

Ore is heated below its melting point in the presence of too much air during roasting, a metallurgical process that turns it into oxide. Roasting is a process for processing sulphide ores while calcination is often used for carbonate oxidation. Sulphide ores are heated or roasted with plenty of air.

Roasting will convert the minerals into metal in the case of sulphates of carbon, lead and silver.

Hence, options A, C and D are correct.

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