1.

The standard oxidationpotentials of Zn,Cu Ag and Ni electrodes are + 0.76 - 0.34 - 0.80 and + 0.25 Vrepectively which of he following reactin will provide maximumvoltage

Answer»

`Cu+2Ag^(+)(aq)rarrCu^(2+)(aq)+2Ag`
`Zn+2Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag`
`H_(2)Ni^(2+)(Aq)rarr2H^(+)(aq)+Ni`
`Zn+Cu^(2+)(aq)rarrZn^(2+)(aq)+Cu`

Solution :Standard oxiditionpotentialof ZnCu Agand Nielectrodes are + 076 - 0.34 - 0.80 and+ 0.25 V respectively
Given `Zn^(2+) +2e^(-) rarr ZnE_(cell)=- 0.76 V`
`Cu^(2+) +2e^(-) rarr Cu , E_(Cell) =+0.34 V`
`AG^(+) +E^(-) rarr Ag, E_(cell) =+ 0.80 V`
`BI^(2+) +2e^(-)rarr Ni , E_(cell) =- 0.25 V`
`a Cu+2Ag(aq) rarr Cu^(2+) (aq)+2 Ag`
B `Zn+2Ag^(+)(Aq)rarr Zn^(23+) (aq)+2 Ag`
`E_(cell)=1.56 V`


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