If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because
Zinc displaces copper from copper sulphate and generates zinc sulphate solution when added to CuSO\(_4\) solution because zinc is a more reactive metal that displaces less reactive metal from its solution. This implies Zinc is more electropositive than Copper. The colour change shows it.
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