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एक अभिक्रिया इस प्रकार से है -
`2Ag^(+)+Cd to2Ag+Cd^(2+)`
अभिक्रिया `Ag^(+)//Ag` व `Cd^(2+)//Cd` के लिए मानक अपचयन विभव `+0.80` तथा `-0.40V` है | (a) सेल का मानक वाहक बल `(E^(@))`क्या है ?
(b) यदि Cd की सांद्रता 1M से घटाकर 0.1 M कर दें तो विधुत वाहक बल पर क्या प्रभाव होगा ?

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(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+)])`

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