1.

Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. 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. Student Aluminium sulphate solution (I) Copper sulphate solution (II) A Colourless changes to light green Blue colour of the solution is retained B Colour of colourless solution does not change Blue colour of the solution changes to light green C Colourless solution changes to light blue Blue colour of the solution changes to colourless D Colour of colourless solution remains unchanged Blue colour of the solution fades away The correct set of observations have been recorded by the students :(1) A(2) B(3) C(4) D

Answer» Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. 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.




























Student Aluminium sulphate solution (I) Copper sulphate solution (II)
A Colourless changes to light green Blue colour of the solution is retained
B Colour of colourless solution does not change Blue colour of the solution changes to light green
C Colourless solution changes to light blue Blue colour of the solution changes to colourless
D

 Colour of colourless solution remains unchanged Blue colour of the solution fades away

The correct set of observations have been recorded by the students :

(1) A

(2) B

(3) C

(4) D


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