CH-1574

Reactivity series

Chemistry · Secondary 4 · Medium · Reactivity series

A student reacts excess magnesium with dilute hydrochloric acid.

Which ionic equation, with state symbols, correctly represents the reaction?

$\text{Mg}(s) + 2\text{H}^+(aq) \rightarrow \text{Mg}^{2+}(aq) + \text{H}_2(g)$
$\text{Mg}^{2+}(aq) + 2\text{Cl}^-(aq) \rightarrow \text{MgCl}_2(aq)$
$\text{Mg}(s) + 2\text{Cl}^-(aq) \rightarrow \text{MgCl}_2(aq) + 2e^-$
$\text{Mg}^{2+}(aq) + \text{H}_2(g) \rightarrow \text{Mg}(s) + 2\text{H}^+(aq)$

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