Why does the colour of CuSO₄ solution fade when iron filings are added?

Question

Accepted Answer

B. {'text': 'Cu²⁺ ions are reduced and replaced by colourless Fe²⁺ ions'}

1. CuSO₄ solution is blue because of dissolved Cu²⁺ ions.
2. Iron is more reactive than copper; it displaces copper.
3. Fe enters solution as colourless Fe²⁺ ions while Cu is deposited as red-brown metal.
4. As blue Cu²⁺ ions are removed, the solution loses its blue colour.
5. Hence the colour fade comes from **Cu²⁺ being replaced by Fe²⁺**.
_Source: Selina Concise ICSE Class 8 Chemistry Ch 6 "Chemical Reactions", Signs of chemical change_

Answer

{'text': 'Iron forms a black precipitate that masks the blue'}

Answer

{'text': 'The solution dilutes due to extra water from iron'}

Answer

{'text': 'Iron simply absorbs blue light from the surroundings'}