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"
Correct answer: (2) B
Explanation: Test-tube I, iron filling is added in aluminium sulphate solution, no colour change will be observed as iron is less reactive than aluminium, so it cannot displace aluminium from its sulphate solution. Hence, no reaction takes place.
Test-tube II, iron filling is added in copper sulphate solution, blue colour changes to light green. As iron is more reactive than copper, hence it displaces aluminium from its sulphate solution.
The chemical equation for the reaction is given below:
$3Fe (s) + Al_2(SO_4)_3 (aq) → 3FeSO_4 (aq) + 2Al (s)$
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