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) What changes do you expect?


(b) Are these changes chemical in nature?


(c) Write a word equation for the chemical change, if any

(a) We expect following changes:

i) Blue colour of the solution changes to green due to formation of new substance ‘iron sulphate’.


ii) There will be brown deposit of copper on iron.


(b) Yes, these changes are chemical in nature as new substances, iron sulphate and copper are formed during the reaction.


(c) The reaction is as follows:


Copper Sulphate solution (blue) + Iron —> Iron Sulphate solution (green) + Copper (brown deposit)


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