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How is galena (PbS) present as impurity ...

How is galena (PbS) present as impurity removed from the ore of zinc blende?

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The finely pulverised ore is mixed with a cheap oil like pine oil, a foaming agent such as a xanthate and a depressant such as sodium cyanide and the mixture is taken into a tank containing water. The mixture is agitated by blowing in compressed air when lead sulfide first forms a froth and is removed. On adding more oil, foaming agent and blowing air, zinc sulfide forms froth and is separated.
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. Write chemical reactions taking place in the extraction of zinc from z...

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  2. Which metal is used to protect the iron sheets from rusting by a proce...

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  3. How is galena (PbS) present as impurity removed from the ore of zinc b...

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  4. Write a balanced equation for the reaction of argentite with KCN and n...

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  5. In moist air, copper corrodes to produce a green layer on the surface....

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  6. In which of the following cases flux is required? (i) In the smelti...

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  7. What is anode mud" in connection with the metallurgy of copper? What i...

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  8. What is the percentage of silver in German silver'?

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  9. Arrange in descending order of carbon content: Stainless steel, mild s...

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  10. Name a metal which may be extracted from the respective ore by both el...

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  11. What is the composition of Copper matte.

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  12. What is meant by self-reduction process?

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

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

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

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  16. What is meant by the term pyrometallurgy?

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

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

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

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

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