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.| Unit3 Chemistry NCERT solution-Grade-10

Q.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

Cooper(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 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:-

Explanation

A + FeSO4 → No reaction, i.e., A is less reactive than iron
A + CuSO4 →Displacement, i.e., A is more reactive than copper
B + FeSO4 → Displacement, i.e., B is more reactive than iron
B + ZnSO4 →No reaction, i.e., B is less reactive than zinc
C + FeSO4 → No reaction, i.e., C is less reactive than iron
C + CuSO4 →No reaction, i.e., C is less reactive than copper
C + ZnSO4 →No reaction, i.e., C is less reactive than zinc
C + AgNO3 → Displacement, i.e., C is more reactive than silver
D + FeSO4/CuSO4/ZnSO4/AgNO3 →No reaction, i.e., D is less reactive than iron, copper, zinc,
and silver
From the above equations, we obtain:

 

unit3-chem-x-q5

(i) B is the most reactive metal.
(ii) If B is added to a solution of copper (II) sulphate, then it would displace copper.
B + CuSO4 →Displacement
(iii) The arrangement of the metals in the order of decreasing reactivity is:
B > A > C > D