Which of the following changes do you expect in the colour of a solution of copper sulphate in a beaker, if a student put a clean iron nail into it and left it for about an hour?

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Blue to green

Green to blue

Red to blue

Blue to red

answer is A.

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Detailed Solution

The solution's colour in the beaker shifts from blue to green.
In the salt solution, iron displaces copper from copper sulphate solution as it is more reactive than copper and turns the colour of solution from blue to green. This is an example of displacement reaction. A red-brown deposit of copper metal is discovered on the iron nail's surface. These modifications are chemical in nature because copper and iron sulphate are created as new compounds. The reaction takes place as
Fe + CuSO4 → FeSO4 + Cu
grey blue green red-brown

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