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During roasting the temperature should b...

During roasting the temperature should be kept below its m.p. Why ?

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If the temperature is raised above m.p. of the ore, it will get mixed with volatile impurities and may vapourise
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AAKASH INSTITUTE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Try yourself
  1. Why are sulphide ores converted to oxide form before reduction to meta...

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  2. Discuss the process of roasting with suitable example.

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  3. During roasting the temperature should be kept below its m.p. Why ?

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  4. What type of the reduction method does the following reaction show (Be...

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  5. Which reducing agent is commonly employed for reduction of (a) ZnO "...

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  6. In some cases, Ellingham diagrams (graphs) show a bend. What do you re...

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  7. On Ellingham diagrams if two graphs intersect each other, what does th...

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  8. Name the four man zones of blast furnace in the extraction of Fe from ...

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  9. Write the complete set of reactions occuring in the zone of reduction ...

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  10. Coke can be used to reduce Cu(2)O. Explain it based on thermodynamic v...

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  11. What is the impure copper collected from Bessemer converter commonly c...

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  12. Name and formulate the main ore from which zinc is extracted.

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  13. What is the impure form of zinc commonly known as ?

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  14. Name and formulate the reagent used for the leaching of argentite.

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  15. What is the hydrometallurgy of silver or gold commonly known as ?

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

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  17. Name two metal which are purified by liquation method.

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  18. Name two metals which are purified by distillation method.

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  19. Impure tin contains SnO(2) as one of the impurities. Name the specific...

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  20. Impure metal 'A' is to be purified by electro-refining method. At whic...

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