Question

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 1

Answer:

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Answer 2

(B) Colourless solution’s colour does not change

Colour of the solution changes to light green from blue colour.  

Explanation:

• The colourless liquid is aluminium sulphate. It will not go through any changes. Because, iron is not more reactive than aluminium.
• Copper sulphate is a blue solution and it can change to green. But, when compared with copper, iron is more reactive.
• So, from copper sulphate, from copper sulphate, it moves iron copper.