General Principles of Metallurgy - Problem Set
Q. What is the main purpose of using a flux in metallurgy?
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A.
To increase the melting point
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B.
To facilitate the reduction of ores
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C.
To remove impurities
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D.
To enhance the color of metals
Solution
Flux is used to remove impurities from ores during the smelting process, improving the quality of the extracted metal.
Correct Answer: C — To remove impurities
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Q. What is the main purpose of using carbon in the extraction of metals from their oxides?
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A.
To increase temperature
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B.
To act as a catalyst
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C.
To reduce metal oxides
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D.
To form alloys
Solution
Carbon is used to reduce metal oxides to their respective metals in a process known as reduction.
Correct Answer: C — To reduce metal oxides
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Q. What is the primary method of extracting copper from its sulfide ores?
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A.
Electrolysis
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B.
Roasting
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C.
Smelting
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D.
Leaching
Solution
Copper is primarily extracted from its sulfide ores through smelting, where it is heated with a reducing agent.
Correct Answer: C — Smelting
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Q. What is the primary oxidation state of iron in Fe2O3?
Solution
In Fe2O3, iron has an oxidation state of +3, as the total charge of the compound must equal zero.
Correct Answer: C — +3
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Q. What is the primary role of a leaching agent in metallurgy?
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A.
To oxidize metals
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B.
To dissolve metal ores
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C.
To precipitate metals
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D.
To reduce metal ions
Solution
A leaching agent is used to dissolve metal ores, allowing for the extraction of metals.
Correct Answer: B — To dissolve metal ores
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Q. Which of the following acids is commonly used in the leaching process of gold?
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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 commonly used in the leaching process to extract gold from its ores.
Correct Answer: D — Cyanide solution
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Q. Which of the following metals is least reactive and can be found in its native state?
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A.
Sodium
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B.
Gold
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C.
Aluminum
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D.
Iron
Solution
Gold is least reactive and is often found in its native state due to its low reactivity.
Correct Answer: B — Gold
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Q. Which of the following metals is most likely to be extracted using electrolysis?
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A.
Iron
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B.
Aluminum
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C.
Copper
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D.
Zinc
Solution
Aluminum is extracted using electrolysis due to its high reactivity and the need for a large amount of energy to reduce it from its ore.
Correct Answer: B — Aluminum
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Q. Which of the following metals is most likely to corrode in the presence of moisture?
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A.
Gold
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B.
Platinum
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C.
Iron
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D.
Aluminum
Solution
Iron is most susceptible to corrosion in the presence of moisture, leading to rust formation.
Correct Answer: C — Iron
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Q. Which of the following processes is used to purify copper?
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A.
Electrolysis
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B.
Roasting
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C.
Calcination
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D.
Smelting
Solution
Electrolysis is used to purify copper by separating it from impurities in the solution.
Correct Answer: A — Electrolysis
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Q. Which of the following statements about coordination compounds is true?
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A.
They always have a positive charge
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B.
They consist of a central metal atom and ligands
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C.
They cannot form isomers
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D.
They are always soluble in water
Solution
Coordination compounds consist of a central metal atom bonded to one or more ligands, which can be neutral or charged.
Correct Answer: B — They consist of a central metal atom and ligands
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