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प्रश्न
Write the chemical equations involved in van Arkel method for refining zirconium metal.
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उत्तर
This method is useful for removing impurities in the form of oxygen and nitrogen in metal like zirconium. The crude metal is heated in an evacuated vessel with iodine. The metal iodine volatilizes.
\[\ce{\underset{\text{Impure}}{Zr} + 2I2 -> \underset{\text{Vapour}}{ZrI4}}\]
The metal iodine is decomposed on tungsten filament, electrically heated to about 1800K. The pure metal is thus deposited on the filament
\[\ce{\underset{\text{Vapour}}{ZrI4} -> \underset{\text{Pure}}{Zr} + 2I2}\]
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संबंधित प्रश्न
Name the method used for the refining of Nickel metal.
Name the method used for the refining of zirconium.
Name the method of refining of metals such as Germanium.
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
Write the principle behind the following methods of refining:
Vapour-phase refining
What happens when Copper matte is charged into silica lined converter and hot air blast is blown?
Name the method of refining which is Used to obtain semiconductor of high purity.
Name the method of refining which is Used to obtain low boiling metal.
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.
Which method is used for refining Zr and Ti? Explain with equation.
How are metals used as semiconductors refined? What is the principle of the method used?
Give two requirements for vapour phase refining.
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 |
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.
Electrolytic reduction method is used for the extraction of ______.
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.
