Extraction of Metals
30 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of adding freshly precipitated aluminium hydroxide to the filtrate?

  • To remove impurities from the filtrate (correct)
  • To reduce the pH of the filtrate
  • To increase the concentration of the filtrate
  • To facilitate the precipitation of aluminium hydroxide

    • Which process involves the reaction between an oxide and aluminium powder to produce a metal?

  • Electrolytic reduction process
  • Hydrometallurgical process
  • Aluminothermic process (correct)
  • Self-reduction process

    • What is the purpose of smelting in the extraction of metals?

  • To reduce the metal oxide to its elemental form
  • To separate the metal from its ore (correct)
  • To convert the ore into a more reactive form
  • To purify the metal

    • What is the distinguishing feature of the self-reduction process?

    <p>It does not require an external reducing agent</p> Signup and view all the answers

    Which process is used to extract metals such as chromium and manganese on a commercial scale?

    <p>Aluminothermic process</p> Signup and view all the answers

    What is the primary purpose of the electrolytic refining process?

    <p>To remove impurities from the metal by deposition on the cathode</p> Signup and view all the answers

    Which of the following statements is TRUE about the reverberatory furnace?

    <p>The fuel burns in a separate part and does not mix with the charge</p> Signup and view all the answers

    What is the reaction at the anode during the extraction of sodium?

    <p>Cl⁻ → Cl + e⁻</p> Signup and view all the answers

    What is the primary difference between calcination and roasting?

    <p>Calcination is used to convert metal oxides into metals, while roasting is used to convert metal sulfides into oxides</p> Signup and view all the answers

    What is the process of extracting metals like gold and silver from their native ores?

    <p>Amalgamation process</p> Signup and view all the answers

    What is the primary purpose of leaching in metallurgy?

    <p>To extract metals from their ores by dissolving the ore in a solvent</p> Signup and view all the answers

    What is the primary difference between smelting and refining?

    <p>Smelting is used to extract metals from their ores, while refining is used to purify metals</p> Signup and view all the answers

    What is the reaction of tin oxide with carbon?

    <p>SnO₂ + 2C → Sn + 2CO</p> Signup and view all the answers

    What is the purpose of refining metals?

    <p>To purify impure metals</p> Signup and view all the answers

    What is the method of extraction used for metals like cadmium, copper, and silver?

    <p>Precipitation or metal displacement method</p> Signup and view all the answers

    What is the primary purpose of cupellation?

    <p>To purify silver by removing lead impurities</p> Signup and view all the answers

    What is the final product obtained through Mond's process?

    <p>Pure nickel</p> Signup and view all the answers

    Which of the following metals are refined using the Van Arkel process?

    <p>Ti, Zr, Hf</p> Signup and view all the answers

    What is the principle behind zone refining or fractional crystallisation?

    <p>Difference in solubility of impurities in molten and solid state of metals</p> Signup and view all the answers

    What is the result of heating impure silver in a blast of air using cupellation?

    <p>Oxidation and removal of lead impurities</p> Signup and view all the answers

    Which method of refining involves the decomposition of a compound into a pure metal?

    <p>Thermal dissociation</p> Signup and view all the answers

    What is the primary method of refining easily fusible metals like lead and tin?

    <p>Liquation</p> Signup and view all the answers

    Which of the following metals can be purified by distillation?

    <p>Zinc and Mercury</p> Signup and view all the answers

    What is the purpose of fractional distillation in the metallurgy of zinc?

    <p>Separating cadmium from zinc</p> Signup and view all the answers

    Which of the following methods of refining involves the formation of a compound, which is then decomposed into a pure metal?

    <p>Thermal dissociation</p> Signup and view all the answers

    What is the primary purpose of concentration or dressing of the ore?

    <p>To separate the large bulk of impurities from the ore</p> Signup and view all the answers

    Which type of ores are very few in nature?

    <p>Metallic halides</p> Signup and view all the answers

    What is the name of the process that separates ore particles based on the difference in specific gravity?

    <p>Gravity Separation or levigation</p> Signup and view all the answers

    What is the name of the table used in the gravity separation process?

    <p>Wilfley table</p> Signup and view all the answers

    What is the term used to describe the large amount of unwanted impurities in the ore?

    <p>Gangue or matrix</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser