Question

Student photo one big iron nail is in 4 test tube containing solution zinc sulphate aluminium sulphate copper sulphate and iron sulphate hand iron sulphate a reddish brown coating was observed only on the surface of iron nail which was put in the position of

Answer 1

When iron is placed in Copper sulphate solution, the iron is coated with a brown coloured substance "copper" and CuSo4 solution changes from blue to light green. This is due to iron displaces copper as it is more reactive than copper.

Reaction: Fe(s) + CuSO4(aq) -----------> Cu(s) + FeSO4(aq)

In other solutions,Fe will not react as it is less reactive the Zinc(Zn) and Aluminium(Al)

Therefore, iron nail was put in copper sulphate.

Regards:

Aakash Maurya