Home
Class 12
CHEMISTRY
(a) Give an example of zone refining of ...

(a) Give an example of zone refining of metals.
(b) What is the role of cryolite in the metallurgy of aluminium?

Text Solution

Verified by Experts

Cryolite is added to bauxite ore before electrolysis because of the following reasons:
(i) It acts as a solvent.
(ii) It lowers the melting point of alumina to about 1173 K
(iii) Addition of cryolite to alumina increases the electrical conductivity.
Promotional Banner

Topper's Solved these Questions

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise NCERT FILE (Ncert Exemplar Problems) (Multiple Choice Questions (Type-I))|13 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise NCERT FILE (Ncert Exemplar Problems) (Multiple Choice Questions (Type-II))|13 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise NCERT FILE (Ncert In-text Questions)|4 Videos

  • ELECTROCHEMISTRY

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|20 Videos

  • HALOALKANES AND HALOARENES

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|11 Videos

Similar Questions

Explore conceptually related problems

What is the role of graphite in the electrometallurgy of aluminium ?

(i) Name the method of refining of nickel (ii) What is the role of cryolite in the extraction of aluminium ? (iii) What is the role of limestone in the extraction of iron from its oxides ?

What is the role of iodine in the refining of titanium ?

MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT FILE (Ncert Textbook Exercises)
  1. Write down the chemical reactions taking place in the extraction of zi...

    Text Solution

    |

  2. State the role of silica in the metallurgy of copper.

    Text Solution

    |

  3. What is meant by the term "chromatography"?

    Text Solution

    |

  4. What criterion is followed for the selectrion of the stationary phase ...

    Text Solution

    |

  5. Describe a method for refining nickel.

    Text Solution

    |

  6. How can you separate alumina from silica in a bauxite ore associated w...

    Text Solution

    |

  7. Giving examples differentiate between roasting and calcination.

    Text Solution

    |

  8. How is ‘cast iron’ different from ‘pig iron”?

    Text Solution

    |

  9. Differentiate between “minerals” and “ores”.

    Text Solution

    |

  10. Why copper matte is put in silica lined converter?

    Text Solution

    |

  11. (a) Give an example of zone refining of metals. (b) What is the role ...

    Text Solution

    |

  12. How is leaching carried out in case of low grade copper ores?

    Text Solution

    |

  13. Why is zinc not extracted from zinc oxide through reduction using CO?

    Text Solution

    |

  14. The value of Deltaf G^@ for the formation of Cr2 O3 is -540 KJ mol^(-1...

    Text Solution

    |

  15. Out of C and CO, which is better reducing agent for ZnO?

    Text Solution

    |

  16. The choice of a reducing agent in a particular case depends on thermod...

    Text Solution

    |

  17. Name the processes from which chlorine is obtained as a by-product. Wh...

    Text Solution

    |

  18. What is the role of graphite rod in the electrometallurgy of aluminium...

    Text Solution

    |

  19. Outline the principles of refining of metals by the following methods ...

    Text Solution

    |

  20. Predict conditions under which Al might be expected to reduce MgO.

    Text Solution

    |