Question

15. Gayithri added few pieces of aluminium metal to two test tubes A and B containing
aqueous solutions of iron sulphate and copper sulphate.
Savithri added iron metal to other test tubes C and D containing aqueous solutions of
aluminium sulphate and copper sulphate.
In which test tube or test tubes will the colour change is observed ? On the basis of this
experiment, state which one is the most reactive metal and why?​

Answer 1

Answer:

n activity series, the elements on the top can displace element at the bottom but not vice versa. From the given question, Aluminium can displace iron and copper sulphate solutions. Hence, colour change will be observed in Test-Tube A and Test-tube B. Iron metal cannot displace aluminium but can displace copper sulphate solution. Hence Test-tube D’s colour will change too.

Thus, colour change observed in A, B and D.

Since aluminium displaces both the elements, it is the most reactive elements among all. It is above both the elements in the activity series.