Question

When an iron knife is dipped in a solution of copper sulphate, a reddish brown layer gets formed on

the knife. Explain.​

Answer 1

Answer:

it is a DISPLACEMENT REACTION. Iron being more reactive than copper displaces it from its aqueous solution. The color of the solution changes to light green and a reddish brown coat is deposed on iron.

Answer 2

A reddish-brown layer gets formed on the knife because:

• The reddish-brown layer formed on the knife is because of the deposit of copper on the knife.
• The iron knife is dipped in copper sulphate solution in this case.
• Iron is an element that is more reactive than copper in the relativity series.
• Therefore displacement reaction occurs in this scenario.
• Displacement reaction means one more reactive metal displaces another less reactive metal from the solution.
• Because iron is more reactive than copper, copper gets displaced from the solution of copper sulphate and deposits as a layer on the knife. This layer forms reddish-brown colour.
• The solution is ferrous sulphate now.
• The chemical reaction is described below:

=> CuSO₄ (Solution) + Fe (Knife) → FeSO₄ (solution) + Cu (knife)

• Hence, the reddish-brown layer is formed on an iron knife.