Chemistry

Problem

Of the following reduction processes, correct processes are : a.

\text{Fe}_2\text{O}_3 + \text{C} \longrightarrow \text{Fe}

\text{ZnO} + \text{C} \longrightarrow \text{Zn}

\text{Ca}_3(\text{PO}_4)_2 + \text{C} \longrightarrow \text{P}

\text{PbO} + \text{C} \longrightarrow \text{Pb}