Home
Class 12
CHEMISTRY
The Gibbs energy for the decomposition o...

The Gibbs energy for the decomposition of `Al_(2)O_(3)` at `500^(@)C` is as follows:
`(2)/(3)Al_(2)O_(3) rarr (4)/(3)Al + O_(2), Delta_(r)G = +966kJ mol^(-1)`
The potential difference needed for electrolytic reeduction of `Al_(2)O_(3)` at `500^(@)C` is at least:

A

`5.0V`

B

`4.5V`

C

`3.0V`

D

`2.5V`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaG =- nFE :. E = (-DeltaG)/(nF)`
`E = (-966 xx 103)/(4 xx 96500) =- 0.25`
`:.` The potential difference needed for the reduction `= 2.5V`
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    ALLEN|Exercise EXERCISE -05 [B]|38 Videos

  • ELECTROCHEMISTRY

    ALLEN|Exercise EXERCISE-04 [B]|23 Videos

  • CHEMISTRY AT A GLANCE

    ALLEN|Exercise ORGANIC CHEMISTRY|483 Videos

  • HYDROCARBON

    ALLEN|Exercise MCQ|15 Videos

Similar Questions

Explore conceptually related problems

The Gibbs energy for the decomposition of Al_(2)O_(3) at 500^(@)C is as follows (2)/(3)A1_(2)O_(3)to (4)/(3) Al+O_(2), Delta_(r) G = + 966KJmol^(-1) The potential difference needed for electrolytic reduction of Al_(2)O_(3) at 500^(@) is at least :

The Gibbs energy for the decomposition of Al_(2)O_(3) at 500^(@)C is as follow : (2)/(3)Al_(2)O_(3) rarr (4)/(3)Al+O_(2), Delta_(r)G= +960 kJ mol^(-1) The potential difference needed for the electrolytic reduction of aluminium oxide (Al_(2)O_(3)) at 500^(@)C is

For 2/3AI_(2)O_(3)rarr 4/3AI+O_(2)DeltaG=-966 KJ at 500^(@)C The potential difference needed fo relectrolytic reduction of AI_(2)O_(3) at 500^(@)C is at least

The Gibbs energy for the decomposition of Al_2 O_3 at 2/3 Al_2O_3 rarr 4/3 Al = O_2 Delta_r G = + 966 k J "mol"^(-1) The potential differnce needed for electrolytic reduction of Al_2 O_3 at 500^@C is at least.

Al_(2)O_(3) reacts with

ALLEN-ELECTROCHEMISTRY-EXERCISE-05 [A]
  1. Consider the following E^o values : E^o Fe^(3+)//FE^(2+)o = + 0.77 ...

    Text Solution

    |

  2. {:("Electrolyte",^^.^(oo)(Scm^(2)mol^(-1))),(KCI,149.9),(KNO(3),145.0)...

    Text Solution

    |

  3. The highest electrical conductivity of the following aqueous solutions...

    Text Solution

    |

  4. Aluminium oxide may be electorlysed at 1000^@C to furnish aluminim met...

    Text Solution

    |

  5. For a spontaneous reaction, DeltaG , equilibrium constant (K) and E(ce...

    Text Solution

    |

  6. The molar conductivities Lambda(NaOAc)^@ and Lambda(HCI)^@ at infinite...

    Text Solution

    |

  7. The resistance of a conductivity cell filled with 0.1 M KCl solution i...

    Text Solution

    |

  8. At 25^(@)C, {:(Ag+I^(-)rarr,AgI+e,,E^(@) =0.152V),(Agrarr,Ag.^(+)+e,,E...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  13. Resistance of 0.2 M solution of an electrolyte is 50 Omega. The specif...

    Text Solution

    |

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

    Text Solution

    |

  15. The standard reduction potential for Zn^(2+)//Zn, Ni^(2+)//Ni and Fe^(...

    Text Solution

    |

  16. Given E("Cr(2)O(7)^(2-)//Cr^(3+))^(@)=1.33V,E(MnO(4)^(-)//Mn^(2+))^(@)...

    Text Solution

    |

  17. The equivalent conductance of NaCl at concentration C and at infinite ...

    Text Solution

    |

  18. In which of the following reaction H(2)O(2) acts as a reducing agents?...

    Text Solution

    |

  19. Resistance of 0.2 M solution of an electrolyte is 50 ohm. The specific...

    Text Solution

    |

  20. Oxidation of succinate ion produces ethylene and carbon dioxide gases....

    Text Solution

    |