Question

A student puts an iron nail in four test tubes containing solution of zinc sulphate, aluminium sulphate, copper sulphte and iron sulphate. a reddish brown coating was observed

Answer 1

iron nail is reddish brown in copper sulphate solution.
hope it is right..
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Answer 2

Answer:

(C) COPPER SULPHATE

Explanation:

As per metal activity series,. Al > Zn > Fe > Cu.

So, Copper is less reactive than Fe. Displacement reaction takes place.

Copper will deposit on the iron nail

CuSO4 + Fe-> FeSO4 + Cu