Which among the following is a displacement reaction?
(a) H2SO4 + Mg ⟶ H2 + MgSO4
(b) CaCO3 ⟶ CaO + CO2
(c) 2H2 + O2 ⟶ 2H2O
(d) CuSO4.5H2O ⟶ CuSO4 + 5H2O
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Solution
(a) H2SO4 + Mg ⟶ H2 + MgSO4
In this reaction, magnesium displaces hydrogen from sulphuric acid to form magnesium sulphate.