Q16.on immersing an iron 1 nail in copper sulphate solution for a few minutes you will observe:-
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Explanation:
The colour of solution changes to green
We will observe a shift of colour from blue to green when immersing iron nails in the CuSO4 solution and a brown deposit will be observed on the iron nails.
Because of its high reactivity, the iron ions slowly displace the copper ions that form their solution. Iron ions undergo a mixed solution while the copper ions are deposited on iron nails due to the displacement reaction. The reaction can be expressed as
CuSO4 + Fe → FeSO4 + Cu
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