Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that the blue colour of the solution changes and a layer gets deposited on iron filings. What is the colour of the solution and the layer deposited?
When iron fillings are added to copper sulphate solution, and iron nails are observed after 10 minutes, then the colour of coating on iron nails would be brown as iron from iron nails displaces copper from its solution and copper gets settled on the nail and the nail turns brown in colour. This change in color is because of the displacement reaction which took place as iron is more reactive than copper and displaces copper from its solution of copper sulphate.