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In the electrolysis of alumina, cryolite...

In the electrolysis of alumina, cryolite is added to

A

lower the melting point of alumina

B

increase the electrical conductivity

C

both (a) and (b)

D

remove impurities from alumina

Text Solution

Verified by Experts

The correct Answer is:
C
Cryolite `..Na_(3)AlF_(6)..` is added to alumina to increase the conductivity and to decrease the melting point during electrolysis.
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AAKASH SERIES-ELEMENTS OF BORON FAMILY-PRACTICE SHEET (EXERCISE - II) LEVEL - II (ADVANCED)
  1. Metal protected by a layer of its own oxide is

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  2. In the electrolysis of alumina, cryolite is added to

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  3. Mineral of aluminium that does not contasin oxygen is

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  4. Conc. HNO(3) can be stored in container of

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  5. Duralumin is an alloy of

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  6. Al(2)O(3) formation involves large quantity of heat evolution which ma...

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  7. AlCl(3) exist as dimer because

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  8. Aluminium is obtained by

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  9. Aluminium vessels should not be washed with materials containing washi...

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  10. Alumiunium chloride exists as dimer, Al(2)Cl(6) in solid state as well...

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  11. Heating an aqueous solution of aluminium chloride to dryness will give...

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  12. Which of the following metal be extracted by using 'A' as a reducing a...

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  13. Which of the following minerals does contains alluminium ?

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  14. Al(2)O(3) can be converted to anhydrous AlCl(3) by heating :

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  15. Alums ae used for

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  16. Alum helps in purifying water by

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  17. Anhydrous AlCl(3) is obtained when

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  18. Identify the correct statements regarding the structure of Al(BH(4))(3...

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  19. Which of the following method can be used for preparation of anhydrous...

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  20. Which of the hydrolysis resction of halides of III - A group elements ...

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