Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows Metal Iron(II) sulphate Copper(II) sulphate Zinc sulphate Silver Nitrate A No reaction Displacement – – B Displacement – – – C No reaction No reaction No reaction Displacement D No reaction No reaction No reaction No reaction Use the table above to answer the following questions about metals A, B, C and D. 1. Which is the most reactive metal? 2. What would you observe if B is added to a solution of Copper (II) sulphate? 3. Arrange the metals A, B, C and D in the order of decreasing reactivity.

(i) Metal B is the most reactive as it gives displacement reaction with iron (II) sulphate.

(ii) When metal B is added to copper (II) sulphate solution, a displacement reaction will take place because of which the blue colour of copper (II) sulphate solution will fade and a red-brown deposit of copper will be formed on metal B.

(iii)Metal B is the most reactive because it displaces iron from its salt solution. Metal A is less reactive because it displaces copper from its salt solution. Metal C is still less reactive because it can displace only silver from its salt solution, and metal D is the least reactive because it cannot displace any metal from its salt solution. Hence, the decreasing order of reactivity of the metals is B > A > C > D.