Which of the following solution will turn blue when placed in copper vessel?

Options

A. `AgNO_(3)`
B. `NaCl`
C. `ZnSO_(4)`
D. `KNO_(3)`

Answer

A

Explanation

`Cu` is placed above `Ag` in electrochemical series. Hence, `Cu` can displace `Ag` from `AgNO_(3)` and itself is oxidised to `Cu^(+)` (blue) ions.
`Cu+2AgNO_(3) rarr Cu(NO_(3))_(2)+2Ag^(+)`