Question

Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solutions. After some time a change will be observe in
(A) I and II
(B) II and III
(C) III and I
(D) All the three

Answer 1

Answer:

option b.ll and lll........

Answer 2

(B) II and III

Explanation:

Aluminum does not react with the solution of copper sulphate, so change will be seen only in II and III.

Aluminium reacts with ferrous sulphate to form Aluminium sulphate and iron.  

3FeSO4 + 2Al → Al2(SO4)3 + 3Fe

When aluminium is added ti zinc sulphate, zinc is displaced by Aluminium to form aluminium sulphate and Zinc.

3ZnSO4 + 2Al → Al2(SO4)3 + 3Zn

So Option B is correct.