Given that,
`E_(Ni^(2+)//Ni)^(@)=-0.25 V, E_(Cu^(2+)//Cu)^(@)=+0.34 V`
`E_(Ag^(+)//Ag)^(@)=+0.80 V, E_(Zn^(2+)//Zn)^(@)=-0.76 V`
Which of the following redox processes will not take place in specified direction ?
A. `Ni^(2+) (aq.) +Cu(s) rarr Ni(s) + Cu^(2+) (aq.)`
B. `Cu(s)+2Ag^(+) (aq.) rarr Cu^(2+) (aq.) +2Ag(s)`
C. `Cu(s)+2H^(+) (aq.) rarr Cu^(2+) (aq.)+H_(2)(g)`
D. `Zn(s)+2H^(+)(aq.) rarr Zn^(2+) (aq.)+H_(2)(g)`
