Question

In the reaction, $2Cu_{2}O_{\left(s\right)}+Cu_{2}S_{\left(s\right)} \rightarrow 6 Cu_{\left(s\right)}+SO_{2\left(g\right)}$ copper acts as a reductant and sulphur acts as an oxidant. The given reaction is not a redox reaction.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (D)

If both assertion and reason are false.

Answer 2

The oxidation states are as : Copper is reduced from $+1$ state to zero. Sulphur is oxidised from $-2$ state to $+4$. $Cu_{2}O$ helps sulphur in $Cu_{2}S$ to increase its oxidation number, hence $Cu(I)$ is an oxidant and sulphur of $Cu_{2}S$ helps copper both in $Cu_{2}S$ and $Cu_{2}O$ to decrease its oxidation number, hence $S$ of $Cu_{2}S$ is a reductant. And the reaction is redox reaction.