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A student puts one big iron nail each in four test tubes containing solution of Zinc sulphate, Aluminium sulphate, Copper sulphate and Iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was put in the solution of

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Aluminium sulphate

Copper sulphate

Zinc sulphate

Iron sulphate

answer is C.

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Detailed Solution

Because iron nail can react with only copper sulphate. Iron nail can’t displace Zn, Al, and Fe from their salt solutions

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