Question 3:
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.
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:
(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
Latest Govt Job & Exam Updates: