General Principles of Metallurgy - Numerical Applications
Q. In the context of metallurgy, what does the term 'calcination' refer to?
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A.
Heating ores in the presence of air
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B.
Heating ores in the absence of air
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C.
Dissolving ores in acid
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D.
Melting ores to separate metals
Solution
Calcination refers to the heating of ores in the absence of air to drive off volatile substances.
Correct Answer: B — Heating ores in the absence of air
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Q. In the extraction of metals, what is the role of a flux?
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A.
To increase the temperature of the reaction
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B.
To remove impurities
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C.
To provide energy for the reaction
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D.
To act as a catalyst
Solution
A flux is used to remove impurities from the metal during the extraction process.
Correct Answer: B — To remove impurities
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Q. What is the main advantage of using a blast furnace in metallurgy?
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A.
It is more energy-efficient than other methods
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B.
It can process large quantities of ore
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C.
It produces purer metals
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D.
It requires less raw material
Solution
The blast furnace can process large quantities of ore, making it efficient for large-scale metal production.
Correct Answer: B — It can process large quantities of ore
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Q. What is the main component of the alloy brass?
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A.
Copper and tin
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B.
Copper and zinc
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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.
Correct Answer: B — Copper and zinc
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Q. What is the oxidation state of chromium in potassium dichromate (K2Cr2O7)?
Solution
In potassium dichromate, chromium has an oxidation state of +6.
Correct Answer: C — +6
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Q. What is the primary purpose of the electrolytic refining process?
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A.
To increase the yield of metal
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B.
To purify the metal
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C.
To alloy metals
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D.
To reduce the cost of extraction
Solution
Electrolytic refining is primarily used to purify metals by removing impurities.
Correct Answer: B — To purify the metal
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Q. What is the primary reaction type involved in the extraction of metals from their ores?
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A.
Decomposition
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B.
Synthesis
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C.
Displacement
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D.
Redox
Solution
The extraction of metals from their ores primarily involves redox reactions.
Correct Answer: D — Redox
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Q. Which acid is commonly used in the leaching process for 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 commonly used in the leaching process for gold extraction.
Correct Answer: D — Cyanide solution
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Q. Which of the following acids is commonly used in the leaching process of metals?
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A.
Sulfuric acid
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B.
Hydrochloric acid
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C.
Nitric acid
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D.
Acetic acid
Solution
Sulfuric acid is commonly used in the leaching process to dissolve metal ores.
Correct Answer: A — Sulfuric acid
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Q. Which of the following is a common reducing agent in metallurgy?
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A.
Oxygen
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B.
Carbon monoxide
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C.
Hydrogen
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D.
Nitrogen
Solution
Carbon monoxide is commonly used as a reducing agent in the extraction of metals from their ores.
Correct Answer: B — Carbon monoxide
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Q. Which of the following metals is extracted using the electrolytic reduction method?
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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 from its ore, bauxite, using electrolytic reduction.
Correct Answer: B — Aluminum
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Q. Which of the following metals is most commonly extracted from its ore using the hydrometallurgical process?
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A.
Gold
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B.
Iron
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C.
Aluminum
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D.
Lead
Solution
Gold is commonly extracted using the hydrometallurgical process, particularly through cyanidation.
Correct Answer: A — Gold
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Q. Which of the following processes is used to concentrate ores?
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A.
Electrolysis
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B.
Leaching
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C.
Roasting
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D.
Smelting
Solution
Leaching is a process used to concentrate ores by dissolving the desired metal into a solution.
Correct Answer: B — Leaching
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