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  4. When a copper wire is placed in a solution of AgNO3, the solution acquires blue colour. This is due to the formation of

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Q. When a copper wire is placed in a solution of $AgNO_{3}$, the solution acquires blue colour. This is due to the formation of

Electrochemistry

Solution:

Since, $Ag^{+}$ ions are reduced to Ag and
$E^{\circ}_{Ag^+/Ag}>E^{\circ}_{Cu^{++}/Cu}$ $Cu$ is oxidized to $Cu^{++}$.