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:

B because A observation was that the AL became green but it cannot be turned into green C observation was that color less solution changes to blue and blue color solution became colorless but we know that if we keep iron into Custom it turns green D observation was that colorless solution color remains same he given this statement correct but he said that blue color of solution fled away but it will turn into green

Answer 2

Answer is Option B

Explanation:

• Aluminium sulphate is colourless and it does not undergo any change as iron does not react with it.  

• Copper sulphate solution is blue which changes into green due to the formation of $FeSO_4$ which is green in colour

So Answer is Option B  

• As Iron does not react with Aluminium Sulphate Solution because Iron is Less reactive then Aluminium. But Iron is more reactive than copper, hence displaces iron Copper from Copper Sulphate.