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What changes in the colour of iron nails and copper sulphate solution do you obserye after keeping

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What changes in the colour of iron nails and copper sulphate solution do you obserye after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
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Iron nails become brownish in colour and the blue colour of copper sulphate solution fades. This is because iron displaces copper from copper sulphate solution and forms ferrous sulphate which is colourless.

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