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| 1. |
why does the colour of copper sulphate solutions change when an iron nail is dipped in it |
| Answer» When an iron nail is dipped in copper sulphate solution, the more reactive iron displaces the less reactive copper from copper sulphate solution.{tex}CuS{O_4}(aq) + Fe(s) \\to FeS{O_4}(aq) + Cu(s){/tex}In this reaction, the iron nails become brownish in colour and blue colour of copper sulphate solution fades away. | |