(a) अभिक्रिया `2Ag^(+)+Cd to2Ag+Cd^(2+)` में Ag का अपचयन हो रहा है जबकि Cd का ऑक्सीकरण होगा |
`:." "E_("cell")^(@)=E_(O.P._((Cd//Cd^(2+))))^(@)+E_(R.P._((Ag^(+)//Ag)))^(@)`
किन्तु `E_(R.P._((Ag^(+)//Ag)))=+0.80V`
`:." "E_(R.P_((Cd^(2+)//Cd)))=-0.40V`
`:." "E_(O.P._((Cd//Cd^(2+))))=0.40V`
`:." "E_("cell")^(@)=0.80+0.40=1.2V`
(b) इसी प्रकार `E_("cell")=E_(O.P.)+E_(R.P.)`
`E_(O.P._((Cd//Cd^(2+))))-(0.059)/(2)",og"[Cd^(2+)]+E_(R.P._((Ag^(+)//Ag)))^(@)+(0.059)/(2)"log"[Ag^(+)]^(2)`
`E_("cell")=E_(O.P._(Cd))^(@)+E_(R.P._(Ag))^(@)+(0.059)/(2)"log"([Ag^(+)]^(2))/([Cd^(2+)])`