General Principles of Metallurgy - Case Studies
Q. In the context of metallurgy, what does the term 'reduction' refer to?
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A.
Loss of electrons
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B.
Gain of electrons
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C.
Increase in oxidation state
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D.
Decrease in temperature
Solution
Reduction refers to the gain of electrons, which is essential in the extraction of metals.
Correct Answer: B — Gain of electrons
Q. What is the main purpose of roasting in metallurgy?
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A.
To purify metals
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B.
To convert sulfides to oxides
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C.
To increase solubility
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D.
To reduce metal ores
Solution
Roasting is used to convert metal sulfides into oxides, making them easier to reduce.
Correct Answer: B — To convert sulfides to oxides
Q. What is the primary component of the alloy brass?
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A.
Copper and zinc
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B.
Copper and tin
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C.
Iron and carbon
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D.
Aluminum and copper
Solution
Brass is primarily an alloy of copper and zinc, known for its corrosion resistance.
Correct Answer: A — Copper and zinc
Q. What is the primary purpose of adding flux during the metallurgy process?
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A.
To reduce oxidation
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B.
To increase melting point
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C.
To remove impurities
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D.
To enhance conductivity
Solution
Flux is added to remove impurities from the metal during the extraction process.
Correct Answer: C — To remove impurities
Q. What is the primary role of carbon in the extraction of iron from its ore?
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A.
To act as a catalyst
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B.
To reduce iron oxide
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C.
To increase melting point
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D.
To form alloys
Solution
Carbon acts as a reducing agent, reducing iron oxide to iron during the extraction process.
Correct Answer: B — To reduce iron oxide
Q. Which acid is commonly used in the leaching process of gold extraction?
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A.
Hydrochloric acid
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B.
Nitric acid
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C.
Sulfuric acid
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D.
Cyanide solution
Solution
Cyanide solution is used in the leaching process to extract gold from its ore.
Correct Answer: D — Cyanide solution
Q. Which of the following is a common method for extracting copper from its ore?
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A.
Electrolysis
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B.
Roasting
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C.
Hydrometallurgy
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D.
All of the above
Solution
Copper can be extracted using various methods including electrolysis, roasting, and hydrometallurgy.
Correct Answer: D — All of the above
Q. Which of the following metals is most likely to be found in its native state?
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A.
Iron
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B.
Gold
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C.
Aluminum
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D.
Copper
Solution
Gold is often found in its native state due to its low reactivity with other elements.
Correct Answer: B — Gold
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