... which was optimized into the commercial Hunter process. Answer the following questions: Question 1. Answer: Lead. Answer: Samacheer Kalvi 12th Chemistry Metallurgy 5 Mark Questions and Answers. The metal iodide volatize and it is decomposed on a tungsten filament, heated to about 1800K. Litharge is an ore of _____. In the 1920s van Arkel had described the thermal decomposition of titanium tetraiodide to give highly pure titanium. Metal of significant ductility was produced in 1925 by the Dutch scientists A.E. Answer: Froth floation. In this method oxygen and nitrogen, present as impurity are removed by heating metal in an evacuated vessel with iodine. X. [1] This process was the first industrial process for the commercial production of pure ductile metallic zirconium.It is used in the production of small quantities of ultra-pure titanium and zirconium. (iii) It is because AS is more positive, AG is more negative, therefore, reduction is easier. ZrI4(s) Zr(s) + 2 I2(g) Question 2. The Iodine in the process of Van Arkel Method helps in producing the ultrapure metals. Write the chemical reactions for purification of Zirconium by Van Arkel’s process. The Kroll process is a pyrometallurgical industrial process used to produce metallic titanium from titanium tetrachloride. Anton Eduard van Arkel. The crystal bar process (also known as iodide process or the van Arkel–de Boer process) was developed by Anton Eduard van Arkel and Jan Hendrik de Boer in 1925. Van Arkel method is used for refining Zirconium or Titanium. Van Arkel method (Vapour Phase Refining ) is the process of refining metal by converting it into its volatile compound and then, decomposing it to obtain a pure metal. He then suggested intermediate species: for example, carbontetrafluoride, CF 4 , which has C-F bonds that are intermediate between ionic and covalent and are polar covalent. (Or) … ; The metal which is crude, one was will be heated up with some compounds to remove the impurities to obtained only the pure metal from the crude. Anton Eduard van Arkel, ('s-Gravenzande Netherlands, 19 November 1893 – Leiden, 14 March 1976) was a Dutch chemist. The process used for the extraction of sodium is Answer: Down’s process. Explain froth floatation process. Given: Pure zirconium is obtained using the two-step Van Arkel process. Nevertheless, Hunter did indicate that the metal had some ductility, and his method of producing it by reacting titanium tetrachloride (TiCl 4) with sodium under vacuum was later commercialized and is now known as the Hunter process. Van Arkel method. (i) Name the method of refining to obtain low boiling metal like mercury, (ii) What is the role of pine oil in froth floatation process? van Arkel and J.H. Answer: (i) van Arkel method is used. Question 12. Van Arkel method is used for refining Zirconium or Titanium. Question 11. In the first step, impure zirconium and iodine are heated to produce zirconium iodide (ZrI4). In this method, oxygen and nitrogen, present as an impurity is removed by heating metal in an evacuated vessel with iodine. The metal can also be purified by the Van Arkel-De Boer process [20], where it is allowed to react with a halogen (e.g., iodine), and the metal halide vapor is then decomposed on a white-hot (1673 K) tungsten wire to yield so-called crystal bar: Sphalerite is concentrated by _____. In the second step, ZrI4 is decomposed to produce pure zirconium. (ii) Zn is used as a reducing agent. 11 relations: Anton Eduard van Arkel, Hafnium, Jan Hendrik de Boer, Kroll process, Protactinium, Thorium, Titanium, Titanium tetraiodide, Vanadium, Zirconium, Zirconium(IV) iodide. The metal iodide formed is volatile and volatile metal iodide is decomposed on a tungsten filament when heated to … The pure metal is deposited on the filament. 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