1.

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

Answer»

`PB(NO_3)_2`
`AgNO_3`
`Zn(NO_3)_2`
`Cd(NO_3)_2`

SOLUTION :`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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