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Given: E(Zn^(+2)//Zn)^(@) =- 0.76V E...


Given:
`E_(Zn^(+2)//Zn)^(@) =- 0.76V`
`E_(Cu^(+2)//Cu)^(@) = +0.34V`
`K_(f)[Cu(NH_(3))_(4)]^(2+) = 4 xx 10^(11)`
`(2.303R)/(F) = 2 xx 10^(-4)`
Find emf at cell of `200K` if `E^(@)` values are independent of temperature `[log 2= 0.3]`

A

1.7 V

B

1.08 V

C

1.09 V

D

1.10 V

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(cell)=E_(cell)^(0)-(2.303RT)/(nF)log(((Zn^(+2)))/((Cu^(+2))))`
`=0.76+0.34-(2.303xx8.31xx200)/(2xx96500)log((2)/(0.2))=1.08"volt"`
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