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Ultra pure silicon is needed by electron...

Ultra pure silicon is needed by electronic industry. By which method of refining, such a high purity silicon is obtained ?

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Zone refining
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. How would you purify a metal like Copper?

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

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

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

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  5. What is the percentage of carbon in steel?

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

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  7. What is the principle of chromatographic separation ?

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  8. Name the most important ore of aluminium.

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  9. When bauxite ore contains considerable amount of silica as an impurity...

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  10. Name two alloys of aluminium and give their composition.

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  11. What is the composition of ignition mixture used in aluminothermy?

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  12. Which process is used to convert pure alumina into aluminium.

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  13. Why cryolite is mixed with alumina during its electrolysis?

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  14. What is the purpose of adding a small amount of CaF2 to alumina during...

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  15. Why aluminium acts as a good reducing agent?

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  16. What is anodised aluminium ?

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  17. What is malachite ?

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  18. List the name and formulae of two important ores of copper.

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  19. What is blister copper?

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  20. Give the composition of brass and German silver

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