`Fe^(3+) to Fe` के लिए मानक अपचयन विभव `(E^@)` क्या है?
दिया हुआ है कि:
`Fe^(2+)+2e^(-)toFe,E_(Fe^(+)//Fe)^@ =-0.47V`
`Fe^(3+)+e^(-)toFe^(3+),E_(Fe^(+)//Fe^(2+))^@ =+0.77V`

Options

A. `-0.057 V`
B. `+0.30V`
C. `-0.30V`
D. `+0.057V`

Answer

A

Explanation

(i) `E_2^@ E_1^@`
.n. गुणांक = 3
`DeltaG_1 = – 3 xx FxxE_1^@`
(ii) `Fe^(3+) +e^(-) to Fe^(2+) E_2^@ ,0.77`
.n. गुणांक = 1
`DeltaG_2 = -1 xx 0।77xxf`
(ii) `Fe^(3+) +2e^(-) to Fe^(2+) E_3^@ ,0.77`
.n. गुणांक = 2
`DeltaG = 0.47 xx 2xxf`
`DeltaG_1 = DeltaG_2 + DeltaG_3`
`-3fE_1^@ = – 1 xx 0.77 xx f+ 2xx0.47 xx f`

`E_1^@ = (-2xx0.47+0.77)/3 = – 0.057V`