Which of the following pairs will give displacement reactions?

(a) NaCl solution and copper metal

(b) MgCl 2 solution and aluminium metal

(c) FeSO 4 solution and silver metal.

(d) AgNO 3 solution and copper metal.



We know that, 

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


Let's consider all options

  1. (a) NaCl solution and copper metal
    Cu is less reactive than Na , therefore it cannot displace Na.

  2. (b) MgCl2 solution and aluminium metal
    Al is less reactive than Mg , therefore it cannot displace Mg.

  3. (c) FeSO4 solution and silver metal
    Ag is less reactive than Fe , therefore it cannot displace Fe.

  4. (d) AgNO3 solution and copper metal.
    Cu is more reactive than Ag , therefore displacement takes place .
    The reaction can be given as :

Reaction between AgNO3 solution and copper metal - Teachoo.png

So, the correct answer is (d) 

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo