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What is the microscopic reason for fading of blue colour of copper sulphate solution?

Answer and explanation

Correct answer: Copper ions decrease

The blue colour of aqueous copper sulphate is associated mainly with hydrated Cu²⁺ ions. When an iron strip is placed in the solution, iron is more reactive and displaces copper: Fe + CuSO₄ → FeSO₄ + Cu. As Cu²⁺ ions are removed from the solution and copper metal is deposited, the intensity of the blue colour decreases; Fe²⁺ may also give the solution a pale green colour. Iron ions do not disappear, and sodium or barium ions are not involved. Therefore option C is correct.

Related tags

ScienceClass 10Displacement ReactionCopper SulphateMetal ReactivityChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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