A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron - Science - Metals and Non-metals

Question

A student added few pieces of aluminium metal to two test tubes A
and B containing aqueous solutions of iron sulphate and copper
sulphate In the second part of her experiment, she added iron metal
to another test tubes C and D containing aqueous solutions of
aluminium sulphate and copper sulphate In which test tube or test
tubes will she observe colour change ? On the basis of this
experiment, state which one is the most reactive metal and why

Goutam Pradhan · Accepted Answer

Solution:Part1Experiment A: 2Al(s)+3FeSO4(aq)→Al2(SO4)3(aq)+3Fe(s)                                   (bluish-green)Experiment B: 2Al(s)+3CuSO4(aq)→Al2(SO4)3(aq)+3Cu(s)                                          (blue)Part2Experiment C: Fe(s)+ Al2(SO4)3(aq)→ No reaction(No Change)Experiment D:Fe(s)+3CuSO4(aq)→  FeSO4(aq) +   Cu(s)                                        (blue)           (bluish-green)  (reddish brown)Color change will be observed in Test tube A,B and D
Since for test tube A and B, Al is more reactive than Fe and Cu and displaces both from their salt solution
For test tube D, Fe is more reactive than Cu hence will displace Cu from its salt solution
But for test tube C, Fe is less reactive than Al hence it won't be able to displace Al from its salt solution
Among these metals, Al is most reactive as it can displace both Fe and Cu from their salt solution(from the reactivity series)