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प्रश्न
Describe a method for refining nickel.
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उत्तर
Mond’s process refines nickel. In this process, nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, a volatile complex.
\[\ce{Ni + 4 CO ->[330 - 350 K] \underset{Nickel tetracarbonyl}{Ni(CO)4}}\]
Then, the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature (450-470 K) to obtain pure nickel metal.
\[\ce{\underset{tetracarbonyl}{\underset{Nickel}{Ni(CO)4}} ->[450-470 K] \underset{Nickel}{Ni} + 4CO}\]
संबंधित प्रश्न
Name the method of refining of metals such as Germanium.
Describe the roles of the following: NaCN in froth floatation process
Explain:
Zone refining
Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?
What is meant by the term “chromatography”?
What criterion is followed for the selection of the stationary phase in chromatography?
Outline the principles of refining of metals by the following method:
Vapour phase refining
Indicate the principle behind the method used for the refining of Nickel.
Write the principle behind the following methods of refining:
Vapour-phase refining
Zone refining is based on the principle that ______.
Electrolytic refining is used to purify which of the following metals?
In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?
(i) Heating with stream of carbon monoxide.
(ii) Heating with iodine.
(iii) Liquation.
(iv) Distillation.
Match the items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Coloured bands | (1) Zone refining |
| (B) Impure metal to volatile complex | (2) Fractional distillation |
| (C) Purification of Ge and Si | (3) Mond Process |
| (D) Purification of mercury | (4) Chromatography |
| (5) Liquation |
Explain the following:
Vapour phase refining method is used for the purification of Ti.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
