1.

Differentiate between roasting and calcination. Explain the two with the help of suitable chemical equations.

Answer»

Roasting: It is a process in which sulphide ore is heated in the presence of oxygen to convert into oxide.

2ZnS + 3O2 → 2ZnO + 2SO2

Calcination: It is a process in which carbonate ore is heated in the absence of air to form oxides.

ZnCO3(s) \(\overset{Heat}{\longrightarrow}\) ZnO(s) + CO2

By reduction process Zn can be extracted from its ore.

Reduction: 2ZnO + C → ZnO + CO2



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