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:Use the Table given above to answer the following questions about metals A, B, C and D: (i) Which is the most reactive metal ? (ii) What would you observe if B is added to a solution of Copper(II) sulphate ? (iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

Samples of four metals A, B, C and D were taken and added to the follo

1.	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:Use the Table given above to answer the following questions about metals A, B, C and D: (i) Which is the most reactive metal ? (ii) What would you observe if B is added to a solution of Copper(II) sulphate ? (iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.
Answer» Solution : (i) Out of iron, copper, ZINC and silver, zinc is at the TOP of activity series. Then comes iron. B givesdisplacement reaction with iron(II) sulphate, therefore, B is most reactive metal. (ii) If B is added to a solution of copper(II) sulphate, displacement reaction will take place. Blue colour of copper sulphate will fade and red-brown PARTICLES of copper will settle down. `B + CuSO_4 to BSO_4 + CU` (iii) The decreasing ORDER of reactivity is : B > A > C > D