Give reason for the following: a) Metals are regarded as electropositive elements. b) When a piece of copper metal is added to a solution of Zinc sulphate, no change take place, but the blue colour of copper sulphate fades away when a piece of zinc is placed in its solution .c) Articles of aluminium do not corrode even though alluminium is an active metal.

Give reason for the following: a) Metals are regarded as electropositi

1.	Give reason for the following: a) Metals are regarded as electropositive elements. b) When a piece of copper metal is added to a solution of Zinc sulphate, no change take place, but the blue colour of copper sulphate fades away when a piece of zinc is placed in its solution .c) Articles of aluminium do not corrode even though alluminium is an active metal.
Answer» Solution :a) Metals have a tendency to lose one or more electrons to form positive ions. Therefore, metals are called electropositive ELEMENTS. Copper is less reactive than Zinc. Therefore, if cannot displace Zinc from `ZnSO_4`solution. But Zinc being more reactive than copper, it DISPLACES copper from `CuSO_4` solution. As a result the concentration of `Cu^(2+)`ions fall and blue COLOUR fades. ` Zn(s) + underset("blue")(CuSO_4(aq) )to underset("colourless")(ZnSO_4 (aq) ) + Cu(s)` c) ALUMINIUM being a reactive metal readily combines with OXYGEN to give a protective layer of `AI_2O_3`. As a result further corrosion stops.