question_answer

  Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II, respectively. A few pieces of iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.

StudentSolution (I)	Solution (II)
A Colourless solution Light green	Blue colour is retained
B Colourless solution No change	Blue colour solution Green
C Colourless solution Light blue	Blue colour solution Green
D No change in colour	Blue colour of solution fades

Which student has recorded the correct observation?         

Answer:

                  Student B Iron does not react with solution because iron is less reactive than aluminium. But Fe being more reactive than Cu displaces Cu from solution.