(a) What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their activities towards water.
Zinc, iron, magnesium, Sodium
(b) Name one metal more reactive and another less reactive than hydrogen.
(c) Name one metal which displaces copper from copper sulphate solution and one which does not.
(d) Name one metal which displaces silver from silver nitrate solution and one which does not.