Question

On placing a piece of zinc metal in the solution of copper sulphate, it acquires a reddish brown coating but when it is placed in a solution of aluminium sulphate, no change is observed. Explain.

Answer 1

Because the copper from the copper sulphate solution gets deposited on the zinc , but with aluminium there is no change because aluminium is more reactive than zinc

Answer 2

When zinc is placed in aluminum sulphate solution then no reaction takes place as zinc is less reactive than aluminum.