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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 used for the refining of Nickel metal.
What is the principle behind the zone refining of metals?
Explain column chromatography.
Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?
Outline the principles of refining of metals by the following method:
Vapour phase refining
Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?
Write the chemical equations involved in van Arkel method for refining zirconium metal.
Name the method of refining which is Used to obtain semiconductor of high purity.
Zone refining is based on the principle that ______.
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.
Assertion: Nickel can be purified by Mond process.
Reason: \[\ce{Ni(CO)4}\] is a volatile compound which decomposes at 460 K to give pure Ni.
Assertion: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
Purification of crude metals by removing metallic and non-metallic impurities is known as ______ of metals.
Refining using liquation method is the most suitable for metals with ______.
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.
