question_answer 13)

               Metallic oxides of zinc, magnesium and copper were heated with the following metals.

Metal	Zinc	Magnesium	Copper
Zinc Oxide Magnesium oxide Copper oxide

  In which cases, will you find displacement reactions taking place ? 

Answer:

Magnesium (Mg) will displace both zinc (Zn) and copper (Cu) from their oxides Zinc will displace copper from copper oxide.  Copper is least reactive and will not participate in displacement reaction.