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Write the principle of the following : ...

Write the principle of the following :
Zone refining.

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This method is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. A circular heater is fixed at one end of a rod of the impure metal. The molten zone moves along the heater which is moved forward. The impurities pass on into the molten zone. Ge and Si are refined by this method.
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U-LIKE SERIES-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-LONG ANSWER QUESTIONS-I
  1. Out of PbS and PbCO(3) (ores of lead), which one is concentrated by f...

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  2. What is the significance of leaching in the extraction of aluminium?

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  3. Write the principle of the following : Zone refining.

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  4. Write the principle of the following : Froth floatation process.

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  5. Write the principle of the following : Chromatography.

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  6. Write the principle of the vapour phase refining.

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  7. What is the role of depressant in froth floatation process?

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  8. Write the name of reducing agent to obtain iron from Fe(2)O(3) at high...

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  9. Name the method of refining of metals such as Germanium.

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  10. In the extraction of Al, impure Al(2)O(3) is dissolved in conc. NaOH t...

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  11. What is the role of coke in the extraction of iron from its oxides?

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  12. Name the method of refining of nickel.

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  13. What is the role of cryolite in the extraction of aluminium?

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  14. What is the role of limestone in the extraction of iron from its oxide...

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  15. Write the role of I2 in the Arkel method of refining.

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  16. Write the role of Cryolite in the extraction of aluminium.

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  17. Write the role of Dilute NaCN in the extraction of silver.

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  18. Indicate the principle behind the method used for the refining of Nick...

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  19. What is the role of dilute NaCN in the extraction of gold?

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  20. What is 'copper matte'?

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