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(i) Name the method of refining of metal...

(i) Name the method of refining of metals such as Germanium.
(ii) In the extraction of Al, impure `Al_(2)O_(3)` is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
(iii) What is the role of coke in the extraction of iron from its oxides?

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Verified by Experts

`Al_2 O_3 + 2Na OH + 3H_2 O to 2Na [Al(OH)_4]`
This process is called leaching.
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Conceptual Questions
  1. Reducing agent of haematite in blast- furnace is

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  2. (a) What is a slag ? (b) Give the principle of zone refining ? ( c...

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  3. Name the method used for the refining of (i) Nickel (ii) Zirconium.

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  4. Pine oil is generally added in the froth floatation process. Explain.

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  5. Giving examples differentiate between roasting and calcination.

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  6. What is meant by benefaction process ?

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  7. Write the equation of the net reaction taking place in Hall Heroult el...

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  8. Why is the froth flotation method selected for the concentration of Su...

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  9. Which of the following reactions taking place in the blast furnace dur...

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  10. Why Al cannot be reduced by carbon?

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  11. What is the role of flux in metallurgical processes?

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  12. Out of C and CO which is a better reducing agent for Feo. (i) In the...

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  13. Name the method of refining of metals such as germanium.

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  14. (i) Name the method of refining of metals such as Germanium. (ii) In...

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  15. Name the method of refining which is based on the principle of adsorpt...

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  16. (i) What is the role of cryolite in the extraction of aluminium ? (i...

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  17. (i) Name the method of refining of metals such as Germanium. (ii) In...

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  18. (a) Write the principle of method used for the refining of germanium. ...

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  19. What is the role of collectors in Froth Floatation process ?

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  20. What is the role of depressant in froth floatation process?

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