A button cell used in watched funcations as follwing `Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq.)+2OH^(-)(aq)` If half cell potentials are `Zn^(2+)(aq.)+2e^(-) rarr Zn(s), E^(@) = -0.76 V` `Ag_(2)O(s)+H_(2)O(l)+2e^(-) rarr 2Ag(s)+2OH^(-)(aq.),, E^(@) = 0.34V` The cell potential will beA. 1.10VB. 0.42VC. 0.84VD. 1.3V

A button cell used in watched funcations as follwing `Zn(s)+Ag_(2)O(s)

1.	A button cell used in watched funcations as follwing `Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq.)+2OH^(-)(aq)` If half cell potentials are `Zn^(2+)(aq.)+2e^(-) rarr Zn(s), E^(@) = -0.76 V` `Ag_(2)O(s)+H_(2)O(l)+2e^(-) rarr 2Ag(s)+2OH^(-)(aq.),, E^(@) = 0.34V` The cell potential will beA. 1.10VB. 0.42VC. 0.84VD. 1.3V
Answer» Correct Answer - A For hy drogen electrode , reduction reaction is `H^(+)+e=(1)/(2)H_(2)` `E_(H^(+)//(1)/(2)H_(2))^(@)=E_(H^(+)//(1)/(2)H_(2))^(@)-(0.059)/(n)"log"(p^(1//2)H_(2))/([H^(+)])` `=0-(0.059)/(n)"log"(1)/(10^(-10))=0.0591` [pH=10means `\|H^(+)\| =10^(-1)M`] `therefore` Oxidation potential `=0.591V`.

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