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Question

When a student put some copper turnings in a colourless solution, he observed that the solution gradually turned blue. The solution is most likely to be :
(1) ferrous sulphate solution
(2) magnesium nitrate solution
(3) silver nitrate solution
(4) copper sulphate solution

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Solution

The silver nitrate solution is colourless in nature. When copper reacts with silver nitrate, it displaces silver from silver nitrate and forms copper nitrate solution, which is of blue colour.

Cu(s)+AgNO3(aq)Cu(NO3)2(aq)Blue Colour+Ag(s)

Hence, the correct answer is option 3.

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