Question

Seema had a blue colour solution of blue vitriol but after a few days, she found that it turns green. She also found a iron nail there was in the solution. Conversion of blue solution into green is a _____. A) physical and reversible change B) physical and irreversible change C) chemical and reversible change D) chemical and irreversible change

Answer 1

Answer:

It is a chemical change which is irreversible.

Explanation:

Fe(s)+CuSO 4 ⟶Cu(s)+FeSO 4

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe 2+ ions and ferrous sulphate solution is formed.