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When iron pieces are added to a blue color copper sulfate solution, the color of copper sulfate changes to

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Green

Brown

Blue black

Blue colour slowly fades to pale

answer is B.

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Detailed Solution

When an iron nail is immersed in the solution of copper sulfate than iron displaces copper from the solution of copper sulfate because iron is more reactive than copper. Therefore copper sulfate solution color changes from blue to pale.

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