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A button cell used in watched funcations...

A button cell used in watched funcations as follwing
`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

1.34V

B

1.10V

C

0.42V

D

0.84V

Text Solution

Verified by Experts

The correct Answer is:
B
]`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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