A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.



(a) (i) Colour of the solution in the beaker changes from blue to green.

(ii) A brown coloured deposit is found on the surface of the iron nail.

(b) The changes are chemical in nature as new substances, iron sulphate (green) and copper (brown) are formed.

copper sulphate

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