Question

4. Why do the colour & 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:(a) Chemical reaction of iron nail with copper sulphate solution in water. ... Thus iron is more reactive than copper. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2 +) is converted into metallic copper.

hope it helps

Answer 2

Answer:

When the chemical reaction of iron nail with copper sulphate solution occour in water then the iron displaces copper ions from an aqueous solution of copper sulphate. Thus iron is more reactive than copper. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2 +) is converted into metallic copper.

So, the colour of copper sulphate solution change, when the iron nail put in the beaker.