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Question

Study the given figure carefully.
Which of the following reactions explains the above change most appropriately?

810140_5ad55e0e118745b5b060452d7fe910be.jpg

A
ZnSO4+CuCuSO4+Zn
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B
CuSO4+FeFeSO4+Cu
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C
FeSO4+CuCuSO4+Fe
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D
CuSO4+ZnZnSO4+Cu
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Solution

The correct option is B CuSO4+FeFeSO4+Cu
The blue coloured solution is CuSO4 solution. Iron (Fe) is more reactive than copper (Cu). So, Fe displaces Cu from the CuSO4 solution and forms FeSO4 solution which is green in color. Brown-red deposition in a test tube is of copper. Such types of reactions are called displacement reactions.

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