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Question

Iron nails were dipped in a solution kept in a test tube. After half an hour, it was observed that the colour of the solution has changed. The solution present in the test tube before the reaction was that of _________.

A
aluminium sulphate
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B
zinc sulphate
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C
iron sulphate
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D
copper sulphate
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Solution

The correct option is D copper sulphate
Iron is more reactive than copper but less reactive than zinc and aluminium.

Hence, it will displace copper from copper sulphate solution and not zinc and aluminium from their respective solution.

The reaction will occur as follows:
Copper Sulphate(Blue)+IronIron Sulphate(Green)+Copper

So, the solution present in the test tube was copper sulphate.

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