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Consider two chemical reactions (A) and (B) that take place during metallurgical process: (A) ZnCO3(s) Δ→ ZnO(s) + CO2(g) (B) 2ZnS(s) + 3O2(g) Δ→ 2ZnO(s) + 2SO2(g) The correct option of names given to them respectively is:

1. (A) is calcination and (B) is roasting
2. Both (A) and (B) are producing same product so both are roasting
3. Both (A) and (B) are producing same product so both are calcination
4. (A) is roasting and (B) is calcination

Correct answer: (A) is calcination and (B) is roasting

Solution

Calcination is the process of heating a substance to drive off carbon dioxide, as seen in reaction (A) with ZnCO3, while roasting involves the reaction of sulfide ores with oxygen to produce oxides and sulfur dioxide, as in reaction (B) with ZnS.

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