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Explain (i) Zone refining...

Explain (i) Zone refining

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Assertion (A) : Zone refining is very useful for the preparation of semiconductors. Reason (R) : A semiconductor is a very pure substance.

Write the principle of the following : Zone refining

Outline the principle of refining of metals by the following methods : (ii) Zone refining

{:("Column - I","Column - II"),("(A) Cyanide process","(i) Ultrapure Ge"),("(B) Froth-floatation","(ii) Dressing of ZnS"),("(C) Electrolytic reduction","(iii) Al extraction"),("(D) Zone refining","(iv) Au extraction"),(,"(v) Purification of Ni"):}

What is Zone refining ? Describe the principle involved in the purification of the metal by this method.

What is the principle of zone refining?

The basic principle of zone refining is -

What is zone refining? Name two metal which is purified by this process.

Outline the principle of refining of metals by the following methods : (i) Distillation

Outline the principle of refining of metals by the following methods : (iii) Electrolysis

CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT EXERCISE QUESTIONS
  1. What is the role of depressant in froth-floatation process?

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  2. Why is the extractio of Cu from pyrites more difficult than that from ...

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  3. Explain (i) Zone refining

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  4. Explain (ii) Column chromatography.

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  5. Out of C and CO, which is better reducing agent at 673K ?

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  6. Name the common elements present in the anode mud in electrolytic refi...

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  7. Write the reactions taking place in different zones in the blast furna...

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  8. Write chemical reactions taking place in the extraction of zinc from z...

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  9. State the role of silica in the metallurgy of copper.

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  10. What is meant by the term, chromatography?

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  11. What criterion is followed for the selection of the stationary phase i...

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  12. Describe a method for refining nickel.

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  13. How can you separate alumina from silica in a bauxite ore associated w...

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  14. Giving examples, differentiate between roasting and calcination.

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  15. How is cast iron different from pig iron?

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  16. Why copper matte is put in silica lined converter?

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  17. Differentiate between minerals and ores.

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  18. What is the role of cryolite in the metallurgy of aluminium?

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  19. How is leaching carried out in case of low grade Cu ores ?

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  20. Why is zinc not extracted from zinc oxide through reduction using CO?

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