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(a) What is a slag ? (b) Give the prin...

(a) What is a slag ?
(b) Give the principle of zone refining ?
( c) An ore sample of galena `(PbS)` is contaminated with zinc blende `(ZnS)`. Give an example of a chemical which can be used to concentrate galena selectively by froth flotation process.
(d) What is meant by the term 'Pyrometallurgy' ?

Text Solution

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NaCN (sodium cyanide) is used as depressant.
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Conceptual Questions
  1. Name three forms of iron. How do these three forms differ?

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  2. Reducing agent of haematite in blast- furnace is

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

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

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

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  6. Giving examples differentiate between roasting and calcination.

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  7. What is meant by benefaction process ?

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

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

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

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  11. Why Al cannot be reduced by carbon?

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

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

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

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

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

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

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

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

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

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