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 was that of

Zinc sulphate

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Copper sulphate

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Iron sulphate

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Aluminium sulphate

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Solution

The correct option is Copper sulphate
Reactivity series is the series of metals based on their reactivity from highest to lowest.

Since iron is more reactive than copper but less reactive than zinc and aluminium, hence it displaces copper from copper sulphate solution.
$C u S O_{4} B l u e + F e \to F e S O_{4} (G r e e n) + C u$

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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 was that of

The correct option is Copper sulphateReactivity series is the series of metals based on their reactivity from highest to lowest.Since iron is more reactive than copper but less reactive than zinc and aluminium, hence it displaces copper from copper sulphate solution. CuSO4Blue+Fe→FeSO4(Green)+Cu