Question

on placing a piece of aluminium metal in the solution of Mercury chloride attack was a Shiny silver is surface but when it is placed in a solution of magnesium sulphate no changes observed explain

Answer 1

aluminium is more reactive than mercury in the first case here. therefore it displaces the metal and forms a silver layer. whereas aluminium cant displace magnesium as magnesium is more reactive than aluminium.

hope the answer is correct.