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The oxidation potentials of Zn, Cu, Ag, ...

The oxidation potentials of Zn, Cu, Ag, `H_(2)` and Ni are 0.76, -0.34, 0.80, 0 and 0.25 volt respectively. Which of the following reactions will provide maximum voltage ?

A

`Cu + 2 Ag^(+) (aq)rarrCu^(2+)(aq)+2 Ag`

B

`Zn+2 Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag`

C

`H_(2)+Ni^(2+)(aq)rarr2H^(+)(aq)+Ni`

D

`Zn+2H^(+)(aq)rarrZn^(2+)(aq)+H_(2)`

Text Solution

Verified by Experts

The correct Answer is:
b
The reduction potential of Zn Cu Ag and Ni are : 0.76,+0.34 +0.80 and -0.25 respective ly the maximum e.m.f of the cell is obtained when the electrode llpotential of the anode is minimum and that of the cathode is maximum i.e Zn and Ag respecitvely
`therefore E.N.F =E_("cathode")E^(@)-E_("anode")^(@)`
=+0.80 -(-0.76)=+1.56V
thus option (b) is correct
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Knowledge Check

  • The oxidation ptentials of Zn, Cu, Ag, H_2 and Ni are 0.76, - 34, - 0.80 . 0. 00, 0. 25 volt, respectively. Which of the following reactions will provide maximum voltage ?

    A
    `Zn+Cu^(2+) rarr Cu+Zn^(2+)`
    B
    `Zn+2Ag^+ rarr 2 Ag+Zn^(2+)`
    C
    ` H_2+Cu^(2+) rarr 2H^+ +Cu`
    D
    ` H_2+Ni^(+2) rarr 2H^+ +Ni`

  • The standard oxidation potentials of Zn,Cu Ag and Ni electrodes are + 0.76 - 0.34 - 0.80 and + 0.25 V repectively which of he following reactin will provide maximum voltage

    A
    `Cu+2Ag^(+)(aq)rarrCu^(2+)(aq)+2Ag`
    B
    `Zn+2Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag`
    C
    `H_(2)Ni^(2+)(Aq)rarr2H^(+)(aq)+Ni`
    D
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  • The standard oxidation potential of Zn ,Cu Ag and Ni electrode are +0.76 -034 -0.80 and +0.25 V respectively which of the following reaction will provide maximum volage ?

    A
    `Cu + 2 Ag^(+) (aq)rarrCu^(2+)(aq)+2 Ag`
    B
    `Zn+2 Ag^(+)(aq)rarrZn^(2+)(aq)+2Ag`
    C
    `H_(2)+Ni^(2+)(aq)rarr2H^(+)(aq)+Ni`
    D
    `Zn+2H^(+)(aq)rarrZn^(2+)(aq)+H_(2)`

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