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Give one main difference between calcina...

Give one main difference between calcination and roasting?

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Calcination is carried out in absence of air while roasting is done in presence of excess of air or oxygen.
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. What is flux? How is it useful ?

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  2. What is slag?

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  3. Give one main difference between calcination and roasting?

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  4. When an acidic flux is used ?

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  5. When a basic flux is used ?

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  6. What is leaching?

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  7. Alumina is concentrated by dissolving in concentrated solution of NaOH...

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  8. What is the role of collectors in froth floatation process? Name two...

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  9. Why sulfide ores are usually concentrated by froth floatation process ...

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  10. What is Ellingham diagram?

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  11. In terms of Ellingham diagram state why Al2O3 cannot be reduced by chr...

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  12. Which reducing agent is used to reduce the oxides of less electroposit...

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  13. Which kind of ores undergo self reduction ?

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  14. What are refractory materials?

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  15. Why is MgO used for lining the inner surface of the furnace?

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  16. Indicate the temperature at which carbon can be used as a reducing age...

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  17. How would you purify a metal like Copper?

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  18. Name the purification method which involves vapour phase extraction.

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  19. Ultra pure silicon is needed by electronic industry. By which method o...

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  20. Name the three main varieties of iron. Which out of them is the purest...

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