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What criterion is followed for the selec...

What criterion is followed for the selection of the stationary phase in chromatography?

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The stationary phase is selected in such a way that the impurities are adsorbed more strongly on the stationary phase than the element to be purified. So, when the solvent is made to run through the column, the impurities are retained by the stationary phase while the pure component is easily eluted.
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT EXERCISE QUESTIONS
  1. State the role of silica in the metallurgy of copper.

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  2. What is meant by the term, chromatography?

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

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  4. Describe a method for refining nickel.

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

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  6. Giving examples, differentiate between roasting and calcination.

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  7. How is cast iron different from pig iron?

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

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  9. Differentiate between minerals and ores.

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

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

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

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  13. The value of (Delta(f)G^(@)) for formation of Cr(2)O(3) is -"540kJ.mol...

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  14. Out of C and CO, which is a better reducing agent for ZnO?

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  15. The choice of a reducing agent in a particular case depends on thermod...

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  16. Name the processes from which chlorine is obtained as a by-product. Wh...

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  17. What is the role of graphite rod in the electrometallurgy of aluminium...

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  18. Outline the principles of refining of metals by the following methods:...

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  19. Outline the principles of refining of metals by the following methods:...

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  20. Outline the principles of refining of metals by the following methods:...

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