(O Level Chem) Does copper react with dilute acids?

Here's an MCQ question.

How many of these reactions produce a gas?

I. adding marble pieces to dilute hydrochloric acid
II. warming limewater + ammonium nitrate
III. adding copper turnings to dilute sulfuric acid
IV. adding manganese(IV) oxide to aqueous hydrogen peroxide

A 1
B 2
C 3
D 4

Reaction I produces carbon dioxide gas: CaCO3 + 2HCl --> CaCl2 + H2O + CO2
Reaction II produces ammonia gas: Ca(OH)2 + 2NH4NO3 --> Ca(NO3)2 + 2H2O + 2NH3
III will not have any reaction because copper is lower than hydrogen in the reactivity series and therefore cannot displace hydrogen.
Reaction IV produces oxygen gas: 2H2O2 --> 2H2O + O2 (Note: The manganese(IV) oxide is the catalyst.) 

Copper is lower than hydrogen in the reactivity series... 

Many students would fall into the pitfall of thinking that since metals react with acids to evolve hydrogen gas, copper would react with dilute acids too. Do not forget that copper is considered unreactive and will not react with dilute acids.