Answer:
?M? = Zinc metal
Zinc occurs as Zinc Carbonate in calamine ore, \[ZnC{{O}_{3}}\]
Zinc can be extracted from the ore by:
(i) Zinc Carbonate is first converted into Zinc Oxide by calcination. When calamine ore (zinc carbonate) is heated strongly in the absence of air, it decomposes to form zinc oxide and carbon dioxide.
\[\underset{\text{(Calamine ore)}}{\mathop{ZnC{{O}_{3}}}}\,\xrightarrow{\text{Calcination}}ZnO\left( s \right) + C{{O}_{2}}\uparrow \]
(ii) Zinc metal is then extracted from zinc oxide by reduction with carbon (coke).
\[\underset{\text{Zinc oxide}}{\mathop{ZnO(s)\mathrm{ }}}\,+\underset{(\text{Coke})}{\mathop{C(s)}}\,\to \underset{\text{Zinc metal}}{\mathop{Zn(s)\mathrm{ }}}\,\mathrm{ }+\mathrm{ }\underset{\begin{smallmatrix} \text{ Carbon} \\ \text{monoxide} \end{smallmatrix}}{\mathop{CO}}\,\uparrow \]
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