When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because, copper

A
Displaces silver from the solution or Is oxidised to ${Cu}^{2 +}$
B
Forms a blue coloured complex with AgNO₃
C
${Cu}^{2 +}$
D
Is reduced to $C u^{2 +}$

Solution:

Cu is above of Ag in electrochemical series and thus $Cu + 2 {Ag}^{+} \to {Cu}^{2 +} + 2 Ag$ reaction occurs and it displaces Ag from its salt solution.

${AgNO}_{3}_{(aq)} + Cu \to Ag + {CuNO}_{3 (aq)}$

Solution:

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