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Chapter 2 ORES MCQs

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1. . Some metals are found in the uncombined free state while others are found in the combined state. What is a deciding factor?
e) None of the above





2. . Soluble metal compounds tend to be found in the _____, whereas insoluble metal compounds tend to be found in the _____.
e) Rivers; oceans





3. . In the process known as 'roasting,' a (n) _____ is chemically converted to a (n) _____.
e) Phosphate; phosphide





4. . Which metal can be found as the free element?
e) Pt





5. . The Hall-Heroult process is used in the production of:
e) Cu





6. . How much magnesium can be obtained from one pound of seawater if the concentration of Mg²⁺ is 0.13 weight percent? Assume 100% recovery.
e) 2.5 grams





7. . For every 100 pounds of iron ore there are 27.8 pounds of magnetite (Fe₃O₄). What is the weight percent iron in this ore?
e) 23.1%





8. . A reaction sequence for the reduction of iron ore is given. Calculate the amount of coke necessary to produce 800 g of Fe.
e) 544 g





9. . What is the charge on the copper ion in the mineral azurite, Cu₃(CO₃)₂(OH)₂?
e) 2−





10. . How many coulombs of electricity are required to produce one metric ton (1000 kg) of magnesium?
e) 5.3 × 10⁸ coulombs





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