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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 Nickel metal.
Name the method of refining of metals such as Germanium.
Describe the roles of the following: NaCN in froth floatation process
Explain column chromatography.
Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?
Describe ‘froth floatation process’ for concentration of sulphide ore.
Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?
Write the principle behind the following methods of refining:
Vapour-phase refining
Name the method of refining which is Used to obtain low boiling metal.
Electrolytic refining is used to purify which of the following metals?
How are metals used as semiconductors refined? What is the principle of the method used?
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: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal.
Reason: Copper is extracted by hydrometallurgy.
Explain the following:
Vapour phase refining method is used for the purification of Ti.
Purification of crude metals by removing metallic and non-metallic impurities is known as ______ of metals.
Describe a method for refining nickel.
Describe a method for refining nickel.
