Given: `E_(Zn^(+2)//Zn)^(@) =- 0.76V` `E_(Cu^(+2)//Cu)^(@) = +0.34V` `K_(f)[Cu(NH_(3))_(4)]^(2+) = 4 xx 10^(11)` `(2.303R)/(F) =

Given:
`E_(Zn^(+2)//Zn)^(@) =- 0.76V`
`E_(Cu^(+2)//Cu)^(@) = +0.34V`
`K_(f)[Cu(NH_(3))_(4)]^(2+) = 4 xx 10^(11)`
`(2.303R)/(F) = 2 xx 10^(-4)`
At what concentration of `Cu^(+2)` emf of the cell will be zero (at 298K) and concentration of `Zn^(+2)` is remains same:
A. 0.81V
B. 1.91V
C. 1.1V
D. 0.72V

Given: `E_(Zn^(+2)//Zn)^(@) =- 0.76V` `E_(Cu^(+2)//Cu)^(@) = +0.34V` `K_(f)[Cu(NH_(3))_(4)]^(2+) = 4 xx 10^(11)` `(2.303R)/(F) = 2 xx 10^(-4)` At what

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