Why the $AgNO _3$ solution become blue when Cu rod is dipped in it?
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Answer
Because of the formation of $Cu ^{+2}$ ion, the colour of solution becomes blue and Ag gets free. $Cu ( s )+2 AgNO _3( aq ) \longrightarrow Cu \left( NO _3\right)( aq )+2 Ag ( s )$
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