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In the extraction of aluminium by Hall-H...

In the extraction of aluminium by Hall-Heroult process purified `AI_(2)O_(3)` is mixed with `CaF_(2)` to

A

lower the melting point of `Al_(2)O_(3)`

B

increases the conductivity of molten mixture

C

reduce `Al^(3+)` into `Al(s)`

D

acts as catalyst

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In electrolysis of A1_(2)O_(3) by Hall-Heroult process:

ALLEN-METALLURGY-EXERCISE -04
  1. At the temperature corresponding to which of the points in Fig. FeO wi...

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  2. Which of the following options are correct?

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  3. In the extraction of aluminium by Hall-Heroult process purified AI(2)O...

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  4. Which of the following statements is correct about the role of substan...

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  5. In the Froth Floatation process, zinc sulphide and lead sulphide can b...

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  6. Common impurities present in bauxite are

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  7. Which of the following ores are concentrated by froth floatation?

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  8. Which of the following reactions occurs during calcination ?

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  9. For the metallurgical process of which of the ores calcined ore can be...

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  10. The main reaction occuring in blast furnace during the extraction of i...

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  11. In which of the following method of purification metal is converted to...

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  12. Which of the following statements are correct?

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  13. In the extraction of chlorine from brine

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  14. Why is an external emf of more than 2.2V required for the extraction o...

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  15. At temperature above 1073K coke can be used to reduce FeO to Fe. How c...

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  16. Wrought iron is the purest form of iron. Write a reation used for the ...

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  17. How is copper extracted from low grade copper ores?

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  18. Write two basic requirements for refining of a metal by Mond process a...

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  19. Although carbon and hydrogen are better reducing agents but they are n...

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  20. How do we separae two sulphide ores by Froth Floatation Method? Explai...

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