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प्रश्न
Assertion: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
विकल्प
Both assertion and reason are true and reason is the correct explanation of assertion.
Both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion is true but reason is false.
Assertion is false but reason is true.
Assertion and reason both are wrong.
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उत्तर
Both assertion and reason are true and reason is the correct explanation of assertion.
Explanation:
van Arkel method is very useful for removing all the oxygen and nitrogen present in the form of impurity in certain metals like Zr and Ti.The crude metal is heated in an evacuated vessel with iodine. The metal iodide being more covalent, volatilises and then decomposes at 1800 K to given pure Zr.
\[\ce{Zr + 2I2 -> ZrI4}\]
\[\ce{ZrI4 ->[1800K] Zr + 2I2}\]
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संबंधित प्रश्न
Name the method used for the refining of zirconium.
Name the method of refining of metals such as Germanium.
What is the principle behind the zone refining of metals?
Describe the roles of the following: NaCN in froth floatation process
Explain:
Zone refining
Explain column chromatography.
Write the chemical equations involved in van Arkel method for refining zirconium metal.
Write the principle behind the following methods of refining:
Vapour-phase refining
Electrolytic refining is used to purify which of the following metals?
In the extraction of chlorine from brine:
(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.
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: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
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.
