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A cleaned alu...

Question

A cleaned aluminium foil was placed in an aqueous solution of zinc sulphate. When the aluminium foil was taken out of the zinc sulphate solution after $15$ minutes, its surface was found to be coated with a silvery grey deposit. From the above observation what can be concluded?

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Solution

Aluminium is more reactive than zinc and so placed above zinc in the reactivity series. Thus when aluminium foil is dipped in a zinc sulphate solution. It will displace zinc from $Z n S O_{4}$ solution and form aluminum sulphate. The displaced Zinc metal which is silver grey in colour will be coated on aluminium.
$3 Z n S O_{4} + 2 A l ⟶ A l_{2} (S O_{4})_{3} + 3 Z n$ (grey deposite)

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