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Four colourless salt solutions are place...

Four colourless salt solutions are placed in separate test tubes and a strip of copper is placed in each. Which solution finally turns blue?

A

`Pb(NO_3)_2`

B

`AgNO_3`

C

`Zn(NO_3)_2`

D

`Cd(NO_3)_2`

Text Solution

Verified by Experts

The correct Answer is:
B
`Zn^(+2)//Zn(0.762) , Cd^(=2) // Cd `
` Pb^(+2)//Pb , Cu^(+2)//Cu`
`Ag^(+)//Ag , m + 2AgNO_3 to Cu(NO_3)_2 + 2Ag^(oplus)`
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