Home
Class 12
CHEMISTRY
Given E(Cr^(3+)//Cr)^(@)=-0.72V, and E...

Given `E_(Cr^(3+)//Cr)^(@)=-0.72V`, and
`E_(Fe^(2+)//Fe)^(@)=-0.42V`
The potential for the cell.
`Cr|Cr^(3+)(0.1M)||Fe^(2+)( 0. 01M)Fe` is

A

0.072V

B

0.3850V

C

0.770V

D

0.270V

Text Solution

Verified by Experts

The correct Answer is:
C
`E_("cell")^(@)=-0.42-(-0.72)=0.3V`
The cell reaction is
`2Cr+3Fe^(3+)r arr2Cr^(3+)+3Fe,n=6`
`E_("cell")=E_("cell")^(@)-(0.0591)/(6)"log"([Cr^(3+)]^(2))/([Fe^(2+)]^(3))`
`=0.30-(0.591)/ (6) "log"((0.1)^(2))/((0.01)^(3))`
`=0.30-(0. 0 5 91)/(6)"log"10^(4)`
`=0.30-(0.0591xx 4)/(6)`
`=0.3 - 0.04=0.2 6V`.
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

Given E_(Cr^(3+)//Cr)^(@)= 0.72V , E_(Fe^(2+)//Fe)^(@)=-0.42V . The potential for the cell Cr|Cr^(3+)(0.1M)||Fe^(2+) (0.01M) | Fe is :

Given E_(Cr^(3+)//cr)^@ =- 0.72 V, E_(Fe^(2+)//Fe)^@ =- 0.42 V . The potential for the cell Cr | Cr^(3+) (0.1 M) || FE^(2+) (0.01 M) | Fe is .

Given : E_(Fe^(3+)//Fe)^(@) = -0.036V, E_(FE^(2+)//Fe)^(@)= -0.439V . The value of electrode potential for the change, Fe_(aq)^(3+) + e^(-)rightarrow Fe^(2+) (aq) will be :

Calculate the e.m.f. of the cell, Cr//Cr^(3+)(0.1 M) || Fe^(2+)(0.01 M)//Fe "Given" : E_(Cr^(3+)//Cr)^(@)=-0.75" V ", E_(Fe^(2+)//Fe)^(@)=-0.45" V " "Cell reaction" : 2Cr(s)+3Fe^(2+)(aq) to 2Cr^(3+)(aq)+3Fe(s) {"Hint". E_(cell)=E_(cell)^(@)-(0.0591V)/(6)"log"([Cr^(3+)]^(2))/([Fe^(2+)]^(3)}

E_(Fe^(3+)//Fe)^(@)=-0.036V,E_(Fe^(2+)//Fe)^(@)=-0.0439V . The value of standard electrode potential for the change, Fe^(3+)(aq)+e^(-)toFe^(2+)(aq) will be

DINESH PUBLICATION-ELECTROCHEMISTRY-SELECTED STRAIGHT OBJECTIVE
  1. The seqeunce of ionic mobility in the aqueous solution is

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  10. Which of the following expressions correctly repesents the equivalent ...

    Text Solution

    |

  11. The reduction potential of hydrogen half cell will be negative if :

    Text Solution

    |

  12. If E(cell)^(ɵ) for a given reaction is negative, which gives the corre...

    Text Solution

    |

  13. Standard electrode potential of three metal X, Y and Z are -1.2 V, +0....

    Text Solution

    |

  14. The electrode potentials for Cu^(2+)+e^(-)toCu^(+) and Cu^(+)e^(-)...

    Text Solution

    |

  15. Standard electrode potential for Sn^(4+)//Sn^(2+) couple is 0.15 V and...

    Text Solution

    |

  16. A buffer solution is prepared in which the concentration of NH(3) is 0...

    Text Solution

    |

  17. Consider the following cell reaction. 2Fe(s)+O(2)(g)+4H^(+)(aq)rarr2...

    Text Solution

    |

  18. Electrolysis is a phenomenon where a reaction is carried out by passin...

    Text Solution

    |

  19. Electrolysis is a phenomenon where a reaction is carried out by passin...

    Text Solution

    |

  20. Electrolysis is a phenomenon where a reaction is carried out by passin...

    Text Solution

    |