Textbook Problem

. For each of the following oxidation-reduction reactions of

metals with nonmetals, identify which element is oxidized and

which is reduced.

a. $\text{4Na}\left(\text{s}\right)+{\text{O}}_2\left(\text{g}\right)\to {\text{2Na}}_{\text{2}}\text{O}\left(\text{s}\right)$   b. $\text{Fe}\left(\text{s}\right)+{\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}\left(\text{aq}\right)\to {\text{FeSO}}_{\text{4}}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\left(\text{g}\right)$   c. ${\text{2Al}}_{\text{2}}{\text{O}}_3\left(\text{s}\right)\to \text{4Al}\left(\text{s}\right)+{\text{3O}}_{\text{2}}\left(\text{g}\right)$   d. $\text{3Mg}\left(\text{s}\right)+{\text{N}}_{\text{2}}\left(\text{g}\right)\to {\text{Mg}}_3{\text{N}}_2\left(\text{s}\right)$