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

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

In which cases will you find displacement reactions taking place?

Answer

The reactivity order of Zn(Zinc), Mg(Magnesium) and Cu(Copper) is as follows

Cu < Zn < Mg ( Mg being the most reactive)

 

We know that, 

  • More reactive metals displace less reactive metals from their salts. 
  • When a less reactive metal is added to the solution/oxide of a more reactive metal , no reaction takes place ,

Thus in the given cases, we observe the following :

 

Metal

Zinc

Magnesium

Copper

(i) Zinc Oxide 

Zn (s) + ZnO  (s) → No reaction

Mg (s) + ZnO (s)  → MgO (s) + Zn (s)

Cu(s) + ZnO → No reaction

(ii) Magnesium Oxide

Zn (s) + MgO  (s) → No reaction

Mg (s) + MgO(s)  → No reaction

Cu (s) + MgO → No reaction

(iii) Copper Oxide

Zn (s) + CuO  (s) → ZnO (s) + Cu (s)

Mg (s) + CuO  (s) → MgO (s) + Cu (s)

Cu (s) + CuO → No reaction

 

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo