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What is meant by self-reduction process?...

What is meant by self-reduction process?

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The reduction of the metal oxide by the ore itself is called self reduction. For example, reduction of cuprous oxide (obtained from partial oxidation of `Cu_2S`) to copper by cuprous sulfide (from matte).
`2Cu_2 S + Cu_2S to underset("(molten)")(6Cu) + SO_2 uarr`
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. Name a metal which may be extracted from the respective ore by both el...

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  2. What is the composition of Copper matte.

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  3. What is meant by self-reduction process?

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  4. An ore sample of galena (PbS) is contaminated with zinc blende (ZnS). ...

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  5. The extraction of Au by leaching with NaCN involves both oxidation and...

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  6. Why is the froth flotation method selected for the concentration of su...

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  7. What is meant by the term pyrometallurgy?

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  8. At a site, low grade copper ores are available and zinc and iron scrap...

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  9. Why is electrolytic reduction preferred over chemical reduction for th...

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  10. Copper matte is charged into a silica lined converter in extraction of...

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  11. What is the role of collectors in froth floatation process ?

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  12. On what principle is chromatography based ?

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  13. What is the role of cryolite in the extraction of pure aluminium from ...

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  14. What is meant by the term native state?

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  15. When an element is found to occur in the native state?

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  16. What type of elements are found to occur in the combined state?

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  17. What is a mineral?

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  18. What is an ore?

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  19. Comment on the statement that all ores are minerals but all the minera...

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  20. What do you mean by gangue or matrix ?

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