Home
Class 12
CHEMISTRY
If E(Fe^(2+))^(@)//Fe = -0.441 V and E...

If `E_(Fe^(2+))^(@)//Fe = -0.441 V`
and `E_(Fe^(3+))^(@)//Fe^(2+) = 0.771 V`
The standard `EMF` of the reaction
`Fe+2Fe^(3+) rarr 3Fe^(2+)`
will be:

A

`1.653" V "`

B

`1.212" V "`

C

`0.111" V "`

D

`0.330" V "`.

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Anode :`Fe to Fe^(2+)+2e^(-)" " E^(@)=-0.441" V "`.
Cathode : `Fe^(3+)+e^(-) to Fe^(2+)]xx2E^(@)=+0.77" V "`.
`E_(cell)=E_(cathode)^(@)-E_(anode)^(@)`
`=+0.771-(-0.441)=1.212" V "`.
Promotional Banner

Topper's Solved these Questions

  • ALCOHOLS AND PHENOLS

    DINESH PUBLICATION|Exercise COMPLETION QUESTION|2 Videos

  • ALCOHOLS AND PHENOLS

    DINESH PUBLICATION|Exercise NCERT In-Text Questions|9 Videos

  • ALDEHYDES AND KETONES

    DINESH PUBLICATION|Exercise Interger|5 Videos

Similar Questions

Explore conceptually related problems

If e_(Fe^(2+) //Fe)^@ =- 0. 44 1V . And E_(Fe^(3+)//Fe^(2+))^(o) = 0. 771 V . The standard emf of the reaction Fe +2 Fe^(3+) rarr 3Fe^(2+) will be .

If E_(Fe^(2+)//Fe)^(@)=-0.440 V and E_(Fe^(3+)//Fe^(2+))^(@)=0.770 V , then E_(Fe^(3+)//Fe)^(@) is -

Reduction potential for the following h alf-cell reaction are Zn rarr Zn rarr Zn^(2+)+2e^(-),E_(Zn^(2+)//Zn)^(@) = -0.76V Fe rarr Fe^(2+)+2e^(-),E_(Fe^(2+)//Fe)^(@) = -0.76V The emf for the cell reaction Fe^(2+)Zn rarr Zn^(2+)+Fe will be

Consider the following E^(@) values E^(o)""_(Fe^(3+)//Fe^(2+))= +0.77 V" "E^(o)""_(Sn^(2+)//Sn)= 0.14V Under standard conditions the EMF for the reaction Sn(s) + 2Fe^(3+) (aq) rarr 2Fe^(2+)(aq)+Sn^(2+)(aq) is :