Question

What happens when aluminium is placed in zinc sulphate solution

Answer 1

Al + ZnSO4 = Al2SO4 + Zn
the zinc sulphate solution turns into Alluminium Sulphate solution.

Answer 2

Since Al is placed higher than An in the reactivity series , hence it can replace An from its salts. Here it replaces zinc to form Al2(SO4)3.
3ZnSO4 +2Al =Al2(SO4)3 + 3Zn