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Question

Which of the following Halogen is used in Van Arkel Method for refining Zirconium or Titanium?


A

Chlorine

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B

Bromine

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C

Iodine

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D

Fluorine

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Solution

The correct option is C

Iodine


Explanation for the correct option:

(c ) Iodine

  • The Van Arkel process is a metallurgical refinement method for zirconium and titanium metal.
  • The major impurities to be eliminated in this type of refining are oxygen and nitrogen
  • These contaminants are eliminated by heating the zirconium or titanium metal in an iodine-filled evacuated vessel.
  • Ti(s)+2I2(s)250°CTiI4(s)
  • The metal then interacts with iodine to generate metal iodide, which is extremely volatile, whereas impurities remain in the vessel because they cannot react with iodine.
  • As a result, the metal iodide is volatilized and heated on a tungsten filament.
  • TiI4(s)Tungstenfilament1400°CTi(s)+2I2(s)
  • When heated over a tungsten filament at roughly1400°C, the metal iodide decomposes into pure metal and iodine.
  • This iodine can then be utilized in a subsequent cycle of refining.
  • Hence this option is correct

Hence the correct option is (c ) Iodine


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