When we place an iron nail in copper sulfate solution the reddish brown coating formed by an iron nail is _______.

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rough and granular

smooth and shining

hard and flaky

soft and dull

answer is B.

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Detailed Solution

Iron nails form a hard, flaky reddish-brown covering when they are submerged in a copper sulfate solution.
A brown copper coating forms on the surface of an iron nail when it is submerged in a copper sulfate solution and the color of the solution shifts from blue to light green.
Due to its higher position in the reactivity series, iron is more reactive than copper.
As a result, the less reactive metal (copper) is forced out of the salt solution by the more reactive metal (iron).
Consequently, the color has changed. When an iron nail comes into touch with moisture, rust develops, giving it a brownish hue. The chemical reaction between iron and copper sulphate is given as: $Fe + {CuSO}_{4} \to {FeSO}_{4} + Cu$