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

1.212V

B

0.111V

C

0.330V

D

1.653V

Text Solution

Verified by Experts

The correct Answer is:
A
The given cell is
`Fe|Fe^(2+)||Fe^(3+)|Fe^(2+)`
`E_("cell")^(@)=E_(Fe^(3+)//Fe^(2+))^(@)-E_(Fe^(2+)//Fe)^(@)`
`=0.771V-(-0.441V)=1.212V`
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    DINESH PUBLICATION|Exercise MATCH-MATRIX|7 Videos

  • ELECTROCHEMISTRY

    DINESH PUBLICATION|Exercise ASSERTION AND REASON|20 Videos

  • ELECTROCHEMISTRY

    DINESH PUBLICATION|Exercise REVISION QUESTIONS FROM COMPETITIVE EXAMS|198 Videos

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise BRAIN STORMING MULTIPLE CHOICE QUESTIONS (MCQS)|13 Videos

  • ETHERS

    DINESH PUBLICATION|Exercise (MCQs)|8 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 :

DINESH PUBLICATION-ELECTROCHEMISTRY-SELECTED STRAIGHT OBJECTIVE
  1. Resistance of a conductivity cell filled with a solution of an electro...

    Text Solution

    |

  2. A hypothetical electrochemical cell is shown below. A|A^(+)(xM)||B^...

    Text Solution

    |

  3. If E(Fe^(2+))^(@)//Fe = -0.441 V and E(Fe^(3+))^(@)//Fe^(2+) = 0.771...

    Text Solution

    |

  4. The charge required for the reduction of 1 mol of MnO(4)^(-) to MnO(2)...

    Text Solution

    |

  5. The products formed when an aqueous solution of NaBr is electrolysed i...

    Text Solution

    |

  6. Calculate the equilibrium constant for the reaction Cu(s)+2Ag^(+)(aq)r...

    Text Solution

    |

  7. The efficiency of a fuel cell is given by:

    Text Solution

    |

  8. The equivalent conductances of two strong electrolytes at infinite di...

    Text Solution

    |

  9. The cell , Zn | Zn^(2+) (1M) || Cu^(2+) (1M) Cu (E("cell")^@ = 1. 10 V...

    Text Solution

    |

  10. Electrolysis of dilute aqueous NaCl solution was carried out by passin...

    Text Solution

    |

  11. On the basis of the following E^(@) values, the stongest oxidizing age...

    Text Solution

    |

  12. The seqeunce of ionic mobility in the aqueous solution is

    Text Solution

    |

  13. Standard free energies of formation (I kJ //mol ) at 298 K are -237 ....

    Text Solution

    |

  14. Given E(Cr^(3+)//Cr)^(@)=-0.72V, and E(Fe^(2+)//Fe)^(@)=-0.42V The...

    Text Solution

    |

  15. Given,{:(E(Fe^(3+) //Fe)^o + 3e Cr E^o =- 0.036 V),(E(Fe^(3+) //Fe)^o...

    Text Solution

    |

  16. The equivalent conductance of M//32 solution of a weak monobasic acid ...

    Text Solution

    |

  17. Consider the following relations for (i) EMF of the cell =(Oxidati...

    Text Solution

    |

  18. The Gibbs energy for the decomposition of Al(2)O(3) at 500^(@)C is as ...

    Text Solution

    |

  19. An increase in equivalent conductance of a strong electrolyte with dil...

    Text Solution

    |

  20. For the reduction of silver ions with copper metal, the standard cell ...

    Text Solution

    |