question_answer 5)

           Samples of four metals A, B, C and D were taken and added to the following solutions one by one. The results obtained have been tabulated as follows :  

Metal	Solution to which metal is added
	Iron (II) sulphate	Copper (II) sulphate	Zinc sulphate	Silver nitrate
A	No reaction	Displacement	-	-
B	Displacement	-	No reaction	-
C	No reaction	No reaction	No reaction	Displacement
D	No reaction	No reaction	No reaction	No reaction

    Use the table given above to answer the following questions : (a) Which is the most reactive metal ?                     (b) What would you observe when B is added to solution of copper (II) sulphate? (c) Arrange the metals. A, B, C and D in order of increasing reactivity. 

Answer:

Based on the activity series, the relative position of the metals involved in solutions is : Zn > Fe > Cu > Ag Metal A is more reactive than copper and less reactive than iron. Metal B is more reactive than iron and less reactive than zinc. Metal C is more reactive than silver only and less reactive than other metals. Metal D is the least reactive in nature. In the light of above information. We can conclude that (a)    Metal B is the most reactive. (b)   Since B is more reactive than iron, it is also more reactive than copper. This means that is would displace copper from copper (II) sulphate solution. The blue colour of solutuion will slowly fade. (c)    The decreasing order of reactivity of metals is: B > A > C >D.