Question

Why do the colour and solution of copper sulphate in a beaker and put an iron nail in
it?​

Answer 1

Answer:

The solution changes into green colour. Because a sought of reaction happens between the iron nail and the copper sulphate solution. That's why the solutions turns into green colour from blue colour

Hope it helps you

Answer 2

Answer:

when we place iron nail in copper sulphate solution, iron displaces copper from its solution because iron is more reactive. hence, the colour of the solution changes from blue to light green.