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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 of refining of metals such as Germanium.
What is the principle behind the zone refining of metals?
Explain the principle of the method of electrolytic refining of metals. Give one example.
What criterion is followed for the selection of the stationary phase in chromatography?
Describe a method for refining nickel.
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?
Indicate the principle behind the method used for the refining of Nickel.
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?
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: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
Assertion: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
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Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
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.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
