Answer
1. Magnesium metal will combine with chlorine.
$Mg(s) + Cl_{2}(g) -> MgCl_{2}(s)$
2. Magnesium will also react with HCl.
$Mg(s) + 2HCl(aq) -> MgCl_{2}(aq) + H_{2}(g)$
3. Neither of the above methods are really practical because magnesium metal is expensive to produce.
Work Step by Step
1. Magnesium metal will combine with chlorine.
$Mg(s) + Cl_{2}(g) -> MgCl_{2}(s)$
2. Magnesium will also react with HCl.
$Mg(s) + 2HCl(aq) -> MgCl_{2}(aq) + H_{2}(g)$
3. Neither of the above methods are really practical because magnesium metal is expensive to produce.