दिया गया है `E_(Cr^(3+)//Cr)^(@)=-0.72V, E_(Fe^(2+)//Fe)^(@)=-0.42V`
सेल `Cr|Cr^(3+)(0.1M)||Fe^(2+)(0.01M)Fe` के लिए विभव है

Options

A. `0.339V`
B. `-0.339V`
C. `-0.26V`
D. `0.26V`

Answer

D

Explanation

`E_("सेल")=E_("सेल")^(@)-0.059/nlogQ`
`=(-0.42+0.72)-0.059/6"log"((0.1)^(2))/((0.01)^(3))([CrtoCr^(3+)+3e^(-)]xx2" "’Fe^(2++2e^(-)toFe]xx3)/(2Cr+3Fe^(++)to2Cr^(3+)+3Fe)`
`E_("सेल")=0.30-0.059/6"log"(10^(-2))/(10^(-6))=0.30-(4xx0.059)/6log10`
`=0.30-0.0393=0.2607` वोल्ट