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In a science fair , a student took two ...

In a science fair , a student took two test tubes labelled A and B filled with copper sulphate solution, then he put magnesium ribbon in test tube A silver foil in tube B. Predict the observation and justify.

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The blue-coloured `CuSO_4` solution in test tube A disappears, and thus, a colourless solution of `MgSO_4` is formed. This is due to higher reactivity of Mg than Cu. Hence, Mg can displace Cu from `CuSO_4` solution, and hence, blue-coloured `CuSO_4` slowly turns colourless. Ag, being less reactive than Cu, cannot displace Cu from `CuSO_4`, and hence, the solution remains blue in colour.
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