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When a basic flux is used ?...

When a basic flux is used ?

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If the ore is associated with acidic impurities like `SiO_2`, some basic flux like `CaCO_3, MgCO_3`, etc. is used to remove the gangue. For example,
`underset("Gangue (acid)")(SiO_2) + underset("Flux (Basic)")(CaO) to underset("Slag")(CaSiO_3)`
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. Give one main difference between calcination and roasting?

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  2. When an acidic flux is used ?

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  3. When a basic flux is used ?

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  4. What is leaching?

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

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

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

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  8. What is Ellingham diagram?

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

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

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  11. Which kind of ores undergo self reduction ?

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  12. What are refractory materials?

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

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

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  15. How would you purify a metal like Copper?

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

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

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

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  19. What is the percentage of carbon in steel?

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  20. A crude metal is heated with iodine to form metal tetraiodide which is...

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