Blue copper sulfate solution become colorless after reacting aluminium because:

copper sulfate losses its color in presence of air

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copper aluminium sulfate is formed which is colorless

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aluminium displaces copper and forms aluminium sulfate solution which is colorless

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none of these

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Solution

The correct option is C aluminium displaces copper and forms aluminium sulfate solution which is colorless
Aluminium is a reactive metal than copper hence when it reacts with copper sulphate aluminium sulphate is formed which is colourless in nature. Hence the solution losses its colour.
$2 A l + 3 C u S O_{4} \to 3 C u + 2 A l (S O_{4})_{3}$

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