Question

A metal which does not react with dilute sulphuric acid is ________________ [Mg/Al/Zn/Cu]

Answer 1

Displacement reactions are those reactions where a more reactive element replaces a less reactive element.

• Reaction with dilute acid is a displacement reaction where hydrogen is displaced by a more reactive element.
• $\mathrm{Mg},\mathrm{Al}$ and $\mathrm{Zn}$ are all more reactive than hydrogen. However, $\mathrm{Cu}$ is not.
• Since it is less reactive than hydrogen, it will not react with dilute acid.
• Thus, a metal which does not react with dilute sulphuric acid is $\mathrm{Cu}$.