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A buttonn cell used in watches function...

A buttonn cell used in watches function as following `Zn(s) +Ag_(2)O(s) +H_(2)O(l) rarr 2Ag(s)+Zn^(2+)(aq)+2OG^(-)(aq), E^(@)=0.34 V`
the cell potential will be

A

1.10 V

B

0.42 V

C

0.84 V

D

1.34 v

Text Solution

Verified by Experts

The correct Answer is:
B
Anode is always sthe site of oxidation thus anode half cell us
`Zn^(2+) (aq)+2e^(-) rarr Zn(s) , E^(@)= -0.76 V`
cathode half cell 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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