General Principles of Metallurgy - Real World Applications
Q. What is the primary method for extracting iron from its ore?
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A.
Electrolysis
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B.
Carbon reduction
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C.
Hydrometallurgy
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D.
Biomining
Solution
Iron is primarily extracted from its ore using carbon reduction in a blast furnace.
Correct Answer: B — Carbon reduction
Q. What is the primary oxidation state of chromium in chromate ions?
Solution
In chromate ions (CrO4^2-), chromium has an oxidation state of +6.
Correct Answer: D — +6
Q. What is the primary purpose of alloying metals?
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A.
To decrease strength
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B.
To improve corrosion resistance
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C.
To increase melting point
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D.
To reduce weight
Solution
Alloying metals is primarily done to improve properties such as strength, corrosion resistance, and other physical characteristics.
Correct Answer: B — To improve corrosion resistance
Q. What is the primary role of reducing agents in metallurgy?
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A.
To oxidize metals
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B.
To reduce metal oxides
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C.
To increase metal reactivity
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D.
To stabilize metal ions
Solution
Reducing agents donate electrons to metal oxides, converting them into pure metals.
Correct Answer: B — To reduce metal oxides
Q. What type of bond is primarily formed in coordination compounds?
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A.
Ionic bond
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B.
Covalent bond
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C.
Metallic bond
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D.
Coordinate covalent bond
Solution
Coordination compounds primarily involve coordinate covalent bonds, where a ligand donates a pair of electrons to a metal ion.
Correct Answer: D — Coordinate covalent bond
Q. Which of the following acids is commonly used in the pickling 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
Hydrochloric acid is commonly used in the pickling process to remove rust and scale from metals.
Correct Answer: B — Hydrochloric acid
Q. Which of the following elements is a common ligand in coordination chemistry?
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A.
Sodium
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B.
Chlorine
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C.
Ammonia
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D.
Calcium
Solution
Ammonia (NH3) is a common ligand that can donate a pair of electrons to a metal center.
Correct Answer: C — Ammonia
Q. Which of the following is a property of acids in aqueous solution?
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A.
Bitter taste
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B.
Slippery feel
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C.
Conduct electricity
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D.
Form precipitates
Solution
Acids in aqueous solution can conduct electricity due to the presence of ions.
Correct Answer: C — Conduct electricity
Q. Which of the following metals is most commonly used in the extraction of aluminum from its ore?
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A.
Iron
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B.
Copper
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C.
Bauxite
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D.
Alumina
Solution
Alumina (Al2O3) is the primary source of aluminum, extracted from bauxite through the Bayer process.
Correct Answer: D — Alumina
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