1.

[Given: E_(Zn^(2+)|Zn)^(@)=-.0.76V K_(f)[Cu(NH_(3))_(4)]^(+2)=4xx10^(11) E_(Cu^(2+)|Cu)^(@)=0.34V At what conc. Of Cu^(+2), emf of the cell will be zero (at 298K) at conc. Of Zn^(+2) is remaining same?

Answer»

`1.03xx10^(-37)`
`1.03xx10^(-20)`
`3.78xx10^(-4)`
0.0068

Answer :A


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