Chemistry 2004 JAMB Past Questions - Question 23: ZnO(S) + CO(g) __Zn(s) + CO₂(g) In the reaction above, zinc has been

Correct Answer

D

Explanation

In the given chemical equation:

\[ \text{ZnO(s) + CO(g) } \rightarrow \text{ Zn(s) + CO}_2\text{(g)} \]

Zinc oxide (\( \text{ZnO} \)) is being reduced to zinc (\( \text{Zn} \)), and carbon monoxide (\( \text{CO} \)) is being oxidized to carbon dioxide (\( \text{CO}_2 \)). Let's break it down:

1. **ZnO is reduced to Zn:** Oxygen is removed from zinc oxide, and zinc gains electrons. The oxidation state of zinc increases from +2 in \( \text{ZnO} \) to 0 in \( \text{Zn} \). This is a reduction reaction.

2. **CO is oxidized to CO₂:** Carbon monoxide loses electrons to form carbon dioxide. The oxidation state of carbon increases from -2 in \( \text{CO} \) to +4 in \( \text{CO}_2 \). This is an oxidation reaction.

So, in the given reaction, zinc is being reduced, and carbon monoxide is being oxidized.