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प्रश्न
Which method is used for refining Zr and Ti? Explain with equation.
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उत्तर
van Arkel method is used for refining Zr and Ti. In this method crude metal is heated with iodine to form volatile unstable compound. The compound is then decomposed to get pure metal.
\[\ce{\underset{Impure}{Zr(s)} + 2I2 ->[870K] ZrI4}\]
\[\ce{ZrI4 ->[1800K] \underset{Pure}{Zr} + 2I2}\]
\[\ce{\underset{Impure}{Ti} + 2I2 ->[523K] TiI4(g)}\]
\[\ce{TiI4 ->[1700K] \underset{Pure}{Ti} + 2I2}\]
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संबंधित प्रश्न
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Name the method of refining which is Used to obtain semiconductor of high purity.
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(i) ∆GΘ for the overall reaction is negative.
(ii) ∆GΘ for the overall reaction is positive.
(iii) EΘ for overall reaction has negative value.
(iv) EΘ for overall reaction has positive value.
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Assertion: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
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Reason: Copper is extracted by hydrometallurgy.
Describe a method for refining nickel.
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