When iron is placed in a blue copper sulphate solution, the solution t…

Question

When iron is placed in a blue copper sulphate solution, the solution turns greenish-blue. This colour change is a sign of:

Accepted Answer

C. {'text': 'A chemical change with new compound'}

1. Blue copper sulphate (CuSO₄) reacts with iron to form green ferrous sulphate (FeSO₄).
2. The change in colour signals that **a new compound is forming** — a chemical change.
3. Equation: Fe + CuSO₄ → FeSO₄ + Cu.
4. Dilution alone would lighten the colour without altering its hue.
_Source: Selina Concise ICSE Class 8 Chemistry Ch 6 "Chemical Reactions", Signs of chemical change_

Answer

{'text': 'A purely physical change'}

Answer

{'text': 'A change of temperature only'}

Answer

{'text': 'Mere dilution of the solution'}