A)
I II III Green Blue Green
B)
I II III Blue Green Green
C)
I II III Green Blue Blue
D)
I II III Blue Blue Blue
Correct Answer: C
Solution :
As iron is more reactive than copper, it displaces copper from copper sulphate solution and green solution of iron sulphate is formed. \[Fe+\underset{\begin{smallmatrix} Blue\,coloured\, \\ solution \end{smallmatrix}}{\mathop{CuS{{O}_{4}}}}\,\to \underset{\begin{smallmatrix} Green\,\,coloured \\ solution \end{smallmatrix}}{\mathop{FeS{{O}_{4}}}}\,+Cu\] Silver and gold are less reactive than copper. So, they do not displace copper from copper sulphate solution. Hence, solution remains blue in colour.
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