Question

the pale green colour of solution after half an hour when iron nail are dipped in copper sulphate solution is due to formation of - (a) FeS. (b) FeS2. (c) FeSO3. (d) FeSO4​

Answer 1

d option could be right

Answer 2

The Correct option is (d) FeSO4​.

The pale green color of the solution after half an hour when iron nails are dipped in copper sulfate solution is due to the formation of - (d) FeSO4.

• The reaction of iron with copper sulfate solution results in the green color of the solution
• The chemical reaction is:-
• Fe + CuSO4= FeSO4 +Cu
• Here, iron reacts with copper sulfate and forms iron sulfate.
• The solution changes the color from blue to green.

• In this reaction, iron is more reactive than copper as it displaces copper from its bond with sulfate and passes into the solution as Fe2+  ions and forms ferrous sulfate.