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Question

Iron nails were dipped in a beaker containing a blue solution. After some time, it was observed that the colour of the solution changed from blue to green. Which of the following reactions correspond to the recorded observations?

A
Fe + CuSO4 → Cu + FeSO4
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B
Fe + ZnSO4 → Zn + FeSO4
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C
Zn + CuSO4 → Cu + ZnSO4
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D
Zn + FeSO4 → Fe + ZnSO4
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Solution

The correct option is A Fe + CuSO4 → Cu + FeSO4
The given blue colour solution is copper sulphate (CuSO4) solution in which iron (Fe) nails are dipped.
Iron is more reactive than copper and, hence, shows a displacement reaction. Iron displaces copper from the copper sulphate to produce ferrous sulphate solution, which is green in colour.
The reaction can be shown as follows:
Fe + CuSO4 → Cu + FeSO4

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