Choose the name of a substance from the box to answer parts (a) to (e). Each name may be used once, more than once or not at all.\ \
argonchlorinehematiteironsodium hydroxide \begin{array}{|ccccc|} \hline \textbf{argon} & \textbf{chlorine} & \textbf{hematite} & \textbf{iron} & \textbf{sodium hydroxide} \\ \hline \end{array} argonchlorinehematiteironsodium hydroxide\ \ Give the name of:
a transition metal used as a catalyst in the Haber process.
an iron ore.
a greenish-yellow gas at room temperature.
a substance used in the purification of drinking water to kill bacteria.
a noble gas with a full outer shell of electrons.
