In which of the following solutions will a bl | vedclass

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(A) The blue color in a solution containing $Cu$ metal is due to the formation of $Cu^{2+}$ ions in the aqueous solution. According to the electrochem

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$AgNO_3$

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(A) The blue color in a solution containing $Cu$ metal is due to the formation of $Cu^{2+}$ ions in the aqueous solution. According to the electrochemical series,$Cu$ can displace metals that are below it in the activity series. Among the given options,$Ag^+$ has a higher reduction potential than $Cu^{2+}/Cu$,meaning $Cu$ can reduce $Ag^+$ to $Ag$ and get oxidized to $Cu^{2+}$. The reaction is: $Cu(s) + 2AgNO_3(aq) \rightarrow Cu(NO_3)_2(aq) + 2Ag(s)$. The resulting $Cu(NO_3)_2$ solution is blue in color. $Zn^{2+}$,$Ba^{2+}$,and $Na^+$ are not reduced by $Cu$ because they are more reactive than $Cu$.

In which of the following solutions will a blue color appear after some time when a piece of $Cu$ metal is added?

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