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(A) Copper metal $(Cu)$ can displace metals that are less reactive than it from their salt solutions. According to the reactivity series,$Cu$ is more

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$AgNO_3$ solution

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(A) Copper metal $(Cu)$ can displace metals that are less reactive than it from their salt solutions. According to the reactivity series,$Cu$ is more reactive than $Ag$ but less reactive than $Zn$,$Ba$,and $Na$. When $Cu$ is added to $AgNO_3$ solution,the following displacement reaction occurs: $Cu(s) + 2AgNO_3(aq) 	o Cu(NO_3)_2(aq) + 2Ag(s)$ The formation of $Cu(NO_3)_2$ in the solution imparts a blue color to it. Therefore,the correct option is $A$.

The following four solutions are kept in separate beakers and copper metal is put in each of them. Which solution will become blue after some time?

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