Question

Which of the following oxides would be reduced by C? ${Al_2 O_3, MgO, ZnO , CaO, Fe_2 O_3 , PbO}$

• A. ${Al_2O_3, PbO }$ and ${CaO}$
• B. ${ZnO, Fe_2O_3}$ and ${PbO }$
• C. ${Fe_2O_3, MgO }$ and ${ Al_2O_3}$
• D. ${MgO, CaO }$ and ${ Al_2O_3}$

Answer 1

Answer: (B)

${ZnO, Fe_2O_3}$ and ${PbO }$

Answer 2

Carbon is used to reduce the elements which are placed lower in the reactivity series. Metals which are highly reactive can not be reduced by carbon.
Hence, $ZnO$, $Fe_2O_3$, and $PbO$ can be reduced by carbon.