Question

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Answer 1

when iron nail is dipped in copper sulphate iron displaces copper and form ferrous sulphate and copper . colour of ferrous sulphate is green

Answer 2

$<v> When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes.</p><p></p><p>The reaction involved here is:</p><p></p><p>Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)</p><p>$