Chapter 20

Chapter 20 - Chapter 20: Metallurgy and the Chemistry of...

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Page 365 Chapter 20: Metallurgy and the Chemistry of Metals 1. All metals are solids at room temperature (25°C) except A) Cs. B) Cd. C) Ga. D) Hg. E) Rb. Ans: D Category: Easy Section: 20.4 2. A naturally occurring substance with a range of chemical composition is A) an element. B) a mineral. C) gangue. D) an ore. E) an amalgam. Ans: B Category: Easy Section: 20.1 3. Which one of these metals would normally be obtained by electrolytic reduction? A) aluminum B) chromium C) copper D) iron E) zinc Ans: A Category: Medium Section: 20.2 4. Which one of these metals would normally be obtained by chemical reduction? A) aluminum B) calcium C) lithium D) sodium E) vanadium Ans: E Category: Medium Section: 20.2 5. The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is know as A) an element. B) a mineral. C) gangue. D) an ore. E) an amalgam. Ans: D Category: Easy Section: 20.1 6. The flotation process used in metallurgy involves A) the roasting of sulfides. D) chemical reduction of a metal. B) separation of gangue from ore. E) zone refining. C) electrolytic reduction. . Ans: B Category: Easy Section: 20.2 7. Metallic sodium is obtained commercially from molten sodium chloride by A) chemical reduction with magnesium. D) zone refining. B) flotation. E) roasting. C) electrolysis. Ans: C Category: Easy Section: 20.2 8. Alloys of iron that contain 1.0–1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called A) steel. B) cast iron. C) coke. D) pig iron. E) hematite. Ans: A Category: Medium Section: 20.2
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Chapter 20: Metallurgy and the Chemistry of Metals Page 366 9. Which of these reactions represents the removal of silica from iron ore in a blast furnace? A) SiO 2 (s) SiO 2 (g) B) SiO 2 (s) + CaO(s) CaSiO 3 (l) C) SiO 2 (s) + 4HF(g) SiF 4 (g) + 2H 2 O(g) D) SiO 2 (s) + C(s) Si(l) + CO 2 (g) E) SiO 2 (s) + CO(g) SiCO 3 (l) Ans: B Category: Medium Section: 20.2 10. The principal reducing agent in a blast furnace is A) CaO(s) B) CaSiO 3 (l) C) CO(g) D) O 2 (g) E) CO 2 (g) Ans: C Category: Medium Section: 20.2 11. In the Hall process, ____________ is reduced ____________. A) nickel; electrolytically B) aluminum; electrolytically C) nickel; by reaction with metallic sodium D) aluminum; by reaction with metallic sodium E) copper; electrolytically Ans: B Category: Medium Section: 20.2 12. Volatile impurities are removed from ores by means of A) roasting. D) flotation. B) amalgamation. E) zone refining. C) electrolysis. Ans: A Category: Medium Section: 20.2 13. In the Mond process, nickel is purified by A) dissolving the crude ore in sulfuric acid, and precipitating the nickel(II) ion as the sulfate salt. B)
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Chapter 20 - Chapter 20: Metallurgy and the Chemistry of...

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