Question

When aluminium metal is placed in the solution of cuso4 acquires a shiny silvery surface. Why?

Answer 1

 In the activity series of metals aluminum is more reactive than copper. So aluminum can displace copper from it's salt sollution. 

Answer 2

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In the activity series of metals aluminum is more reactive than copper.

So aluminum can displace copper from it's salt sollution.

CuSO4 + Al------) Al2(SO4)3 + Cu.

As the reaction proceeds

The blue color of copper sulphate decolourizes

Solution turn colourless .

Red colour copper is deposited on the aluminum strip. .