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

Correct answer: (3) silver nitrate solution

Explanation: When copper reacts with silver nitrate solution (colourless), it displaces silver from its nitrate solution and forms copper nitrate solution (blue).

The chemical equation for the reaction is given below:

$Cu (s) + AgNO_3 (aq) (colourless) → Cu(NO_3)_2 (aq) (Blue)+Ag (s)$

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Updated on: 10-Oct-2022

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