A student puts one big iron nail each in four test tubes containing solutions 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
A. zinc sulphate
B. iron sulphate
C. copper sulphate
D. aluminium sulphate
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Answer:
c =copper sulphate.... .....
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