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Iron nails were dipped in a solution and kept in a test tube. After half an hour, it was observed that the color of the solution had changed. The solution in the test tube was that of

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Aluminium sulphate

Copper sulphate

Iron sulphate

Zinc sulphate

answer is B.

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Detailed Solution

Iron is more reactive than copper, hence can displace copper from copper sulfate. Zn and Al are more reactive than iron, so Fe cannot displace them.

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