A student addd few pieces of aluminium metal to two test tubes A and B containingaqueoussolutions of ironsulphateand copper sulphate. In the second part ofher experiment, the added iron metal to anothertest tubes C and D containing aqueoussolutions of aluminium sulphateand copper sulphate. In which test tube ortest tubeswill sheobservecolourchange? On the basis of this experiment, statewhich one is the most reactivemetal and why ?

A student addd few pieces of aluminium metal to two test tubes A and B

1.	A student addd few pieces of aluminium metal to two test tubes A and B containingaqueoussolutions of ironsulphateand copper sulphate. In the second part ofher experiment, the added iron metal to anothertest tubes C and D containing aqueoussolutions of aluminium sulphateand copper sulphate. In which test tube ortest tubeswill sheobservecolourchange? On the basis of this experiment, statewhich one is the most reactivemetal and why ?
Answer» Solution :The chemical reactions involved in all the FOUR TUBES are listed. `"Test tube A : "underset("(Lightgreen)")(3FeSO_(4)(aq))+2Al(s)rarrunderset("(COLOURLESS)")(Al_(2)(SO_(4))_(3)(aq))+3Fe(s)` `"Test tube B : "underset("(Blue)")(3CuSO_(4)(aq))+2Al(s)rarrunderset("(Colourless)")(Al_(2)(SO_(4))_(3)(aq))+3Cu(s)` `"Test tube C : "underset("(Colouless)")(Al_(2)(SO_(4))_(3)(aq))+Fe(s)rarrunderset("(No colour change)")("No chemical reaction")` `"Test tube D : "underset("(Blue)")(Cu(SO_(4))(aq))+Fe(s)rarrunderset("(No colour change)")(FeSO_(4)(s)+Cu(s))` Change of colour will be OBSERVED in test tubes A, B, and D while the solution will remain colourless in test tube C. On the basis of the chemical reactions, listed above, Aluminium (Al) is the most reactive metal because it has displaced all other metals from their aqueous salt solutions.