A student prepared an aqueous solution of CuSO4 in beaker X and an aqueous solution of FeSO4 in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours, he observed that the solution in X and Y respectively appears:
(a) Blue and green. (b) Colourless and pale green. (c) Colourless and light blue. (d) Greenish and colourless.
Correct answer: (d) Greenish and colourless.
Explanation:
Reaction in Beaker X:
$Fe + CuSO_4(aq) (blue) \rightarrow FeSO_4(aq)(green) + Cu$
Reaction in Beaker Y:
$Zn + FeSO_4(aq) (green) \rightarrow ZnSO4(aq) (colourless) + Fe$
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