Chemistry - Metallurgy Question with Solution | TestHub

Calcination is the process of heating ore in the absence or limited supply of air. It is mainly used for carbonates and hydrated ores.

(A) $\mathrm{CaC}{\mathrm{O}}_3\to \mathrm{CaO}+\mathrm{C}{\mathrm{O}}_2$ Calcination

(B) $2Fe{\mathrm{S}}_2+\frac{11}{2}{\mathrm{O}}_2\to \mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3+4\mathrm{S}{\mathrm{O}}_2$ Roasting (air required)

(C) $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3\cdot \mathrm{x}{\mathrm{H}}_2\mathrm{O}\to \mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3+\mathrm{x}{\mathrm{H}}_2\mathrm{O}$ Calcination

(D) $\mathrm{ZnS}+\frac{3}{2}{\mathrm{O}}_2\to \mathrm{ZnO}+\mathrm{S}{\mathrm{O}}_2$ Roasting

Therefore, the reactions occurring during calcination are:

A and C