Question

why do the color and solution of copper sulphate change when we take a solution of copper sulphate in a beaker and put an iron nail in it?
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Answer 1

Answer:

because iron displace copper from a solution of copper sulphate

Answer 2

Answer:

when an iron nail is put in the solution of copper sulphate the colour changes due to the displacement reaction occurring in the beaker where iron displaces copper and forms iron sulphate .

Explanation:

Iron being more elecropositive than copper metal, iron will gets oxidised