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Hall-Heroult's process is given by :...

Hall-Heroult's process is given by :

A

`Cr_2 O_3 + 2Al to Al_2 O_3 + 2Cr`

B

`Cu^(2+) (aq) + H_2 (g) to Cu(s) + 2H^(+)(aq)`

C

`ZnO + C overset("Coke" 1673K)to Zn + CO`

D

`2Al_2 O_3 + 3C to4Al + 3CO_2`

Text Solution

Verified by Experts

The correct Answer is:
D
`2Al_2 O_3 + 3C to4Al + 3CO_2`
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-COMPETION FILE (Objective Questions) (Multiple Choice Question from competitive examinations)
  1. Electrolytic refining's is ued to purify which of the following metals...

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  2. the common impurities present in bauxite are

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  3. Carnallite is an ore of

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  4. Which of the following is not a mineral of iron?

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  5. The one that is not a carbonate ore is:

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  6. Match the refining methods (Column I) with metals (Column II).

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  7. The correct statement is :

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  8. The pair that does NOT require calcination is :

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  9. The reaction that does NOT define calcination is :

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  10. Match the ores (Column A) with the metals (Column B) :

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  11. in the Hall -Heroult process, aluminium is formed at the athode , ...

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  12. The correct statement is

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  13. Assertion : For the extraction of iron, haematite are is used. Reaso...

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  14. The ore that contains both iron and copper is :

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  15. Hall-Heroult's process is given by :

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  16. Extraction of zinc from zinc blende is achieved by:

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  17. Oxidation states of the metal in the minerals haematite and magnetite ...

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  18. In the cyanide extraction process of silver from argentite ore, the ox...

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  19. Sulphide ores are common for the metals

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  20. Calamine, malachite, magnetite and cryolite, respectively, are

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