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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)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 be

A

`1.34" V "`

B

`1.10" V "`

C

`0.42" V "`

D

`0.84" V "`

Text Solution

Verified by Experts

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