WAEC - Chemistry (2001 - No. 10)
Which of the following pairs of reagents react to produce hydrogen?
Zinc and concentrated trioxonitrate (V) acid
Water and calcium dicarbide
Copper and dilute hydrochloric acid
Magnesium and dilute tetraoxosulphate (VI) acid
Explication
When magnesium reacts with dilute sulfuric acid, it produces magnesium sulfate and hydrogen gas.
The chemical equation for this reaction is:
Mg(s) + H2SO4(aq) → MgSO4(aq) + H2(g)