For each chemical reaction listed in the table below, decide whether the highlighted atom is being oxidized or reduced.
\begin{tabular}{|c|c|c|c|}
\hline \multirow[b]{2}{*}{reaction} & \multicolumn{3}{|l|}{highlighted atom is being...} \\
\hline & oxidized & reduced & neither oxidized nor reduced \\
\hline \( \mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rightarrow \mathrm{ZnSO}_{4}(a q)+\mathrm{Cu}(\mathrm{s}) \) & 0 & - & \( \bigcirc \) \\
\hline \( \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{~s})+\mathrm{H}_{3} \mathrm{PO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Na}_{2} \mathrm{HPO}_{4}(\mathrm{aq})+\mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(l) \) & \( \bigcirc \) & \( \bigcirc \) & - \\
\hline \( \mathrm{P}_{4}(\mathrm{~s})+5 \mathrm{O}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(l) \rightarrow 4 \mathrm{H}_{3} \mathrm{PO}_{4}(a q) \) & - & \( \bigcirc \) & 0 \\
\hline \( \mathrm{CO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g}) \) & 0 & \( \bigcirc \) & - \\
\hline
\end{tabular}