Chemistry - Metallurgy Question with Solution | TestHub

The question asks to identify the reaction representing the reduction of a calcined or roasted ore into metal.

Option C shows the reduction of zinc oxide (ZnO), a calcined or roasted ore, by carbon (C) to produce zinc metal (Zn) and carbon monoxide (CO). This is a common pyrometallurgical process.

The reaction is:

$$\mathrm{ZnO}+\mathrm{C}\to \mathrm{Zn}+\mathrm{CO}$$

In this reaction, zinc in ZnO (oxidation state +2) is reduced to Zn metal (oxidation state 0), while carbon (oxidation state 0) is oxidized to carbon monoxide (oxidation state +2). This fits the description of reducing a calcined/roasted ore to metal.