Question

Balance and classify the following reaction
Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)

Answer 1

The balanced reaction is following:

$Mg_{(S)}+2HCl_{(aq)} \rightarrow MgCl_{2(aq)}+H_{2(g)}$

It is oxidation-reduction exchange reaction.