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A button cell used in watches functions ...

A button cell used in watches functions as following :
`Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr 2Ag(s)+Zn^(2+)(aq)+2OH^(-)(aq)`
In half - cell potentials are :
`Zn^(2+)(aq)+2e rarr Zn(s), E^(@)=-0.76V and Ag_(2)O(s)+H_(2)O(l)+2e rarr 2Ag(s)+2OH^(-)(aq), E^(@)=0.34V`

A

1.34V

B

1.10V

C

0.42V

D

0.84V

Text Solution

Verified by Experts

The correct Answer is:
B
`E_("cell")^(@)=E_("cathode")^(@)-E_("anode")^(@)`
`=0.34-(-0.76)=+1.10V`
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