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Electrolytic reduction of alumina to alu...

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:

A

in the presence of NaCl

B

in the presence of fluorite

C

in the presence of cryolite which forms a melt with higher melting temperature

D

in the presence of cryolite which forms a melt with lower melting temperature

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The correct Answer is:
D
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Statement-1:Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried in the presence of cryolite. Statement-2:Cryolite contains aluminium.

Electrolytic reduction of alumina to aluminum by the Hall-Heroult process is carried out

Hall-Heroult's process is given by :

The funciton of adding cryolite in the electrolytic reduction of alumina by Hall-Heroult process is to :

NARAYNA-METALLURGY-EXERCISE-1 (HOME WORK)(EXTRACTION OF METALS)
  1. Heating pyrites in air to remove sulphur dioxide is known as

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  2. Calcination and roasting are generally carried out in

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  3. Roasting is carried out in case of:

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  4. An ore after levigation is found to have basic impurities. Which of th...

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  5. Which of the following processes involves smelting ?

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  6. The substance which is added to ore in order to remove impurities duri...

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  7. The process of bringing the metal or its ore into solution by the acti...

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  8. The extraction of which of the following metals involves bassemerisati...

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  9. Which of the following statements is correct regrading the slag obtain...

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  10. Which is the strongest reducing agent?

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  11. The process in which the ore is heated in excess of air below its metl...

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  12. Which of the following metals are extracted by electrolytic reduction?

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  13. Cryolite is:

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  14. The least stable oxide at room temperature is

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  15. The oxidation state of Fe in Fe(3)O(8) is

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  16. The iron obtained from the blast furnace is called:

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  17. Which of the following elements contitutes a major impurity in pig iro...

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  18. In the course of a chemical reaction an oxidant -

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  19. Electrolytic reduction of alumina to aluminium by Hall-Heroult process...

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