(Solved): c. In the following reaction, identify which element is oxidized and which is reduced by assigning ...

c. In the following reaction, identify which element is oxidized and which is reduced by assigning oxidation numbers: $3\mathrm{CuS}(s)+8{\mathrm{HNO}}_3(aq)\to 3{\mathrm{CuSO}}_4(aq)+8\mathrm{NO}(g)+4{\mathrm{H}}_2\mathrm{O}(l)$ sulfur is oxidized; nitrogen is reduced sulfur is reduced; nitrogen is oxidized copper is reduced; nitrogen is oxidized copper is oxidized; nitrogen is reduced d. In the following reaction, identify which element is oxidized and which is reduced by assigning oxidation numbers: $2\mathrm{Mg}(s)+{\mathrm{O}}_2(g)\to 2\mathrm{MgO}(s)$ magnesium is reduced; oxygen is reduced magnesium is oxidized; oxygen is oxidized magnesium is oxidized; oxygen is reduced