(a) Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.
MgCO3(s) + 2HCl(aq) → MgCl2(aq) + CO2(g) + H2O(l)
(b) Sodium hydroxide reacts with sulphuric acid to produced sodium sulphate and water.
2NaOH(aq) + H2O4(aq) → Na2SO4(aq) + 2H2O(l)
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