Question

Student added few pieces of aluminium metal to test tubes A and B containing equations solution of iron sulphate and copper sulphate in the second part of her experiment she added iron metal to another test tube c and d containing equation solution of Aluminium Sulphate and copper sulphate in which test tube or test tubes will you observe colour change on what basis of this experiment state which one is the most reactive metal and why

Answer 1

The test tubes containing iron sulphate and copper sulphate that is the test tube a and b will observe colour change because Aluminum is more reactive metal than Iron and copper so it will displace them in the aqueous solution.
 

Answer 2

in first case ,
the colour change occurs in the test tubes A, B and D because in these test tubes when react with metal show displacement reaction which cause in the change of colour.
and in second case ,we conclude that the aluminium is most reactive metal because it displaces both the iron and copper from its compounds and iron is less reactive than aluminium so it can not displace aluminium from its compound.