1.

A buttonn cell used in watchesfunction as followingZn(s) +Ag_(2)O(s) +H_(2)O(l) rarr 2Ag(s)+Zn^(2+)(aq)+2OG^(-)(aq), E^(@)=0.34 V the cellpotential will be

Answer»

1.10 V
0.42 V
0.84 V
1.34 v

Solution :Anodeis always sthe SITE of oxidation THUS anode half cell us
`Zn^(2+) (aq)+2e^(-) RARR Zn(s) , E^(@)= -0.76 V`
cathodehalfcell is
`Ag_(2) O(s)+H_(2)O(I)+2e^(-) rarr 2Ag(s)+2OH^(-) (aq)`
`E^(@)=0.34 V`
`E_(cell)^(@)=E_(CATHODE)^(@) - E_(anode)^(@) =0.34 -(-0.76) =+1.10 V`


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