1.

A button cell used in watches function as following Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq)+2OH^(-)(aq) if half cell potential are Zn^(2+)(aq)+2e^(-)toZn(s), Ag_(2)O(s)+H_(2)O(l)+2e^(-)to2Ag(s)+2OH^(-)(aq),E^(@)=0.34V The cell potential will be

Answer»

1.34V
1.10V
0.42V
0.84V

Solution :]`ZN^(2+)(AQ)+2e^(-)toZn(s),E^(o)=-0.76V`
`Ag_(2)O(s)+H_(2)O(l)+2e^(-)to2Ag(s)+2OH^(-)(aq),E^(o)=0.34V`
`Zn(s)+Ag_(2)O(s)+H_(2)O(l)+2e^(-)to2Ag(s)+2OH^(-)(aq)`
`+2OH^(-)(aq),E_(CELL)=?`
`E_(cell)^(o)=(E_(R.P.)^(o))_("cathode")-(E_(R.P.)^(o))_("anode")`
`E_(cell)^(o)=0.34(-0.76)=1.10V`
`E_(cell)=E_(cell)^(o)=1.10V`


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