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Describe a method for refining nickel....

Describe a method for refining nickel.

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For refining nickel, nickel is heated in a stream of carbon monoxide forming volatile complex (nickel tetracarbonyl).
`Ni + 4CO overset(330-350K)to Ni(CO)_(4)`
The carbonyl is subjected to high temperature so that the complex decomposes to give the pure metal.
`Ni(CO)_4 overset(450-470 K)to Ni + 4CO`
This process is called Mond Process.
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT FILE (Ncert Textbook Exercises)
  1. Write down the chemical reactions taking place in the extraction of zi...

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

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  3. What is meant by the term "chromatography"?

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  4. What criterion is followed for the selectrion of the stationary phase ...

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  5. Describe a method for refining nickel.

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

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  7. Giving examples differentiate between roasting and calcination.

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  8. How is ‘cast iron’ different from ‘pig iron”?

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  9. Differentiate between “minerals” and “ores”.

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

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  11. (a) Give an example of zone refining of metals. (b) What is the role ...

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  12. How is leaching carried out in case of low grade copper ores?

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

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  14. The value of Deltaf G^@ for the formation of Cr2 O3 is -540 KJ mol^(-1...

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

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

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

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

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

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  20. Predict conditions under which Al might be expected to reduce MgO.

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