Question

Obtaining copper sulfate from copper by using hot and concentrated sulfuric acid is a:

• A. redox reaction
• B. neutralisation reaction
• C. displacement reaction
• D. both A and B

Answer 1

The correct option is A redox reaction

Copper(II) oxide is an amphoteric oxide, so it dissolves in mineral acids such as hydrochloric acid, sulfuric acid or nitric acid to give the corresponding copper(II) salts.Copper does not displace hydrogen from non-oxidising acids like $HCl$ or dilute $H_{2}S{O}_4$. But, concentrated sulphuric acid is an oxidising agent. So, when copper is heated with conc.$H_{2}S{O}_4$, a redox reaction occurs and the acid gets reduced to sulphur dioxide

$CuO+H_{2}S{O}_4\to CuS{O}_4+H_{2}O$