Question

On immersing an iron nail in CuSO4 solution for few minutes, you will observe

(a) no reaction takes place

(b) the colour of solution fades away


(c) the surface of iron nails acquire a black coating

(d) the colour of solution changes to green​

Answer 1

Answer:

(d) the colour of solution changes to green​

Explanation:

We will observe a shift of colour from blue to green when immersing iron nails in the CuSO4 solution and a brown deposit will be observed on the iron nails.

Because of its high reactivity, the iron ions slowly displace the copper ions that form their solution. Iron ions undergo a mixed solution while the copper ions are deposited on iron nails due to the displacement reaction. The reaction can be expressed as

CuSO4 + Fe → FeSO4 + Cu