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Q.

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

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a

Copper sulfate

b

Zinc sulfate

c

Iron sulfate

d

Aluminum sulfate

answer is C.

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Detailed Solution

Copper sulphate

CuSO4+Fe→FeSO4+Cu

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