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What happens to the blue colour of copper sulphate solution when iron nails are left in it?

Question
What happens to the blue colour of copper sulphate solution when iron nails are left in it?
It becomes darker blue
It fades, since iron sulphate is formed instead
It turns red
It has no effect on the colour
Answer
It fades, since iron sulphate is formed instead
Detailed Explanation
As iron displaces copper from solution, iron sulphate (which is pale) forms in place of copper sulphate, so the blue colour fades.
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