Home
Class 12
CHEMISTRY
Given, standard electrode potentials, ...

Given, standard electrode potentials,
`{:(Fe^(3+)+3e^(-) rarr Fe,,,E^(@) = -0.036 " volt"),(Fe^(2+)+2e^(-)rarr Fe,,,E^(@) = - 0.440 " volt"):}`
The standard electrode potential `E^(@)` for `Fe^(3+) + e^(-) rarr Fe^(2+)` is :

A

`-0.476` volt

B

`-0.404` volt

C

`0.440` volt

D

`0.772` volt

Text Solution

Verified by Experts

The correct Answer is:
D
`Fe^(3+)+3e^(-)rarr Fe Delta G_(1)= -nF E_("cell")^(@)= -3F E_("cell")^(@)`
`Fe^(2+)+2e^(-)rarr Fe Delta G_(2)= - 2F E_("cell")^(@)`
`Fe^(3+)+e^(-)rarr Fe^(2+) Delta G_(3)= -F E_("cell")^(@)`
required `:' Delta G_(3) = Delta G_(1)-Delta G_(2)`
`-F E_("cell")= -3F E_("cell")^(@)+2F E_("cell")`
`-E_("cell")= -3xx(0.036)+2(-0.440)`
`-E_("cell")= -0.772` `E_("cell"= +0.772 V`
Promotional Banner

Similar Questions

Explore conceptually related problems

Given, {:(E_(Fe^(3+) //Fe)^o + 3e Cr E^o =- 0.036 V),(E_(Fe^(3+) //Fe)^o =- 0.439 V):} The value of standard electrode ptoential for the charge,

The standard electrode potentials (reduction) of Pt//Fe^(3+),Fe^(+2) and Pt//Sn^(4+),Sn^(+2) are +0.77V and 0.15V respectively at 25^(@)C . The standard EMF of the reaction Sn^(4+) +2Fe^(2+) rarr Sn^(2+) +2Fe^(3+) is

Cu^(+) + e rarr Cu, E^(@) = X_(1) volt, Cu^(2+) + 2e rarr Cu, E^(@) = X_(2) X_(2) volt For Cu^(2+) + e rarr Cu^(+), E^(@) will be :

Consider the following standard reduction potentials:- {:(Fe^(+)+2e^(-)hArrFe,,,E^(@) =- 0.41V),(Ag^(+)+e^(-)hArrAg,,,E^(+)=0.80V),(O_(2)+2H_(2)O+4e^(-)hArr4OH^(-),,,E^(@)=0.40V):} What would happens if a block of silver metal is connected to a buried iron pipe via a wire:-

Consider the following E^o values : E^o _Fe^(3+)//FE^(2+)o = + 0.77 V E_(Sn^(2+)//Sn) =- 0.14 V Under standard conditions the potential for reaction Sn(s) +2Fe^(3+) (aq) rarr 2Fe^(2+) (sq) + Sn^(2+) (aq) is.