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Describe a method for refining nickel....

Describe a method for refining nickel.

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Nickel can be refined by Mond process. Nickel is heated,in a stream of, CO forming a volatile complex, nickel tetracarbonyI. Ni+4 CO stackrel330-350 ~K/rarr Ni(CO)_4 The carbonyl is subjected to higher temperature (450-470 K) so that it is decomposed giving the pure metal. beginaligned Ni(CO)_4, 450-470 ~K, Ni+cdot 4 CO ...
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V PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION BANK
  1. What is meant by the term,' Chromatography' ?

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

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  3. Describe a method for refining nickel.

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

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  5. Giving examples, differentiate between 'roasting' and 'calcination'.

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  6. How is 'cast iron ' different from 'pig iron'?

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  7. All ores are minerals, but all minerals are not ores. Why?

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

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  9. Alumina is mixed with cryolite and subjected to electrolysis to extrac...

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

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

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  12. The value of Deltar G for formation of Cr2 O3 is -540 kJmol^-1 and th...

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

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

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  15. Name the process from which chlorine is obtained as a by-product.What...

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  16. What is the role of graphite rod in the electrometallugy of aluminium?

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

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

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  19. All ores are minerals, but all minerals are not ores.Is this statement...

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  20. Explain the term gangue,flux and slag.

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