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
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Magnesium and dilute tetraoxosulphate (VI) acid
The correct answer is: D
Explanation
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)