Question

Which of the following is not observed when aluminium is added to a solution of copper sulphate?

a) Final solution is light green.

b) Solution is blue in the beginning.

c) The brown mass is deposited on aluminium.

d) Final solution is colourless.

Answer 1

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 aluminium