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The standard electrode potentials of Zn ...

The standard electrode potentials of Zn and Ni respectively are -0.76 V and -0.25 V. Then the standard emf of the spontaneous cell by coupling these under standard conditions is

A

`+1.01 V`

B

`-0.51 V`

C

`+0.51 V`

D

`+0.25 V`

Text Solution

Verified by Experts

The correct Answer is:
C
The standard electrode potential of
`Zn(E_("anode")^(@))=-0.76V`
The standard eelctrode potential of `Ni(E_("cathode")^(@))=-0.25`
From equation
`E_("cell")^(@)=E_(("cathode"))^(@)-E_(("anode"))^(@)`
`=-0.25-(-0.76)=+0.51V`
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