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In the activity with iron nails placed in copper sulphate solution, what colour change is observed in the iron nails?

Question
In the activity with iron nails placed in copper sulphate solution, what colour change is observed in the iron nails?
They turn white
They become coated with a brownish deposit
They turn black
No change is observed
Answer
They become coated with a brownish deposit
Detailed Explanation
Iron displaces copper from the copper sulphate solution, and the copper metal deposits on the iron nails, giving them a brownish coating.
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