Q. In the context of metallurgy, what does the term 'flux' refer to?
A.
A reducing agent
B.
A substance that promotes melting
C.
An oxidizing agent
D.
A type of metal
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Solution
Flux is a substance added to a metallurgical process to promote melting and help remove impurities.
Correct Answer:
B
— A substance that promotes melting
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Q. In the context of metallurgy, what does the term 'gangue' refer to?
A.
The desired metal
B.
The waste material
C.
The reducing agent
D.
The flux used
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Solution
Gangue refers to the waste material that is separated from the desired metal during the extraction process.
Correct Answer:
B
— The waste material
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Q. What is the main purpose of calcination in metallurgy?
A.
To remove moisture
B.
To convert carbonates to oxides
C.
To reduce metal ores
D.
To purify metals
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Solution
Calcination is primarily used to convert carbonates to oxides by heating them in the absence of air.
Correct Answer:
B
— To convert carbonates to oxides
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Q. What is the main purpose of using carbon in the extraction of metals from their ores?
A.
To increase melting point
B.
To act as a reducing agent
C.
To form alloys
D.
To enhance conductivity
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Solution
Carbon is used as a reducing agent in the extraction of metals, particularly in the smelting of iron.
Correct Answer:
B
— To act as a reducing agent
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Q. What is the primary oxidation state of iron in the mineral hematite?
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Solution
In hematite (Fe2O3), iron is primarily in the +3 oxidation state.
Correct Answer:
C
— +3
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Q. What is the primary purpose of roasting in metallurgy?
A.
To reduce metal oxides
B.
To remove impurities
C.
To convert sulfide ores to oxides
D.
To increase metal yield
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Solution
Roasting is used to convert sulfide ores into oxides, making them easier to reduce.
Correct Answer:
C
— To convert sulfide ores to oxides
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Q. What is the primary role of flux in metallurgy?
A.
To increase temperature
B.
To reduce metal oxides
C.
To combine with impurities
D.
To enhance metal properties
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Solution
Flux combines with impurities to form a slag that can be removed during the smelting process.
Correct Answer:
C
— To combine with impurities
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Q. What is the role of a ligand in coordination compounds?
A.
To donate electrons
B.
To stabilize the metal ion
C.
To increase solubility
D.
To act as a catalyst
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Solution
A ligand is a molecule or ion that donates electron pairs to a metal ion to form a coordination complex.
Correct Answer:
A
— To donate electrons
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Q. Which of the following acids is commonly used in the leaching process of gold extraction?
A.
Hydrochloric acid
B.
Nitric acid
C.
Sulfuric acid
D.
Cyanide solution
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Solution
Cyanide solution is used in the leaching process to dissolve gold from its ore.
Correct Answer:
D
— Cyanide solution
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Q. Which of the following elements is most likely to form a coordination compound with a coordination number of 6?
A.
Copper
B.
Iron
C.
Nickel
D.
Cobalt
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Solution
Cobalt commonly forms coordination compounds with a coordination number of 6 due to its ability to accommodate six ligands.
Correct Answer:
D
— Cobalt
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Q. Which of the following is a characteristic of a good reducing agent?
A.
High electronegativity
B.
High ionization energy
C.
Low oxidation potential
D.
High oxidation potential
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Solution
A good reducing agent has a low oxidation potential, allowing it to easily donate electrons.
Correct Answer:
C
— Low oxidation potential
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Q. Which of the following is NOT a method of metal extraction?
A.
Hydrometallurgy
B.
Pyrometallurgy
C.
Biomining
D.
Electrolysis
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Solution
Hydrometallurgy is a method of extracting metals from ores using aqueous solutions, while the other options are traditional extraction methods.
Correct Answer:
A
— Hydrometallurgy
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Q. Which of the following metals is most commonly extracted using the electrolysis method?
A.
Iron
B.
Aluminum
C.
Copper
D.
Zinc
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Solution
Aluminum is extracted from its ore, bauxite, using electrolysis due to its high reactivity.
Correct Answer:
B
— Aluminum
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Q. Which of the following metals is most commonly extracted using the electrolytic reduction method?
A.
Aluminum
B.
Iron
C.
Copper
D.
Zinc
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Solution
Aluminum is extracted from its ore, bauxite, using the Hall-Héroult process, which involves electrolytic reduction.
Correct Answer:
A
— Aluminum
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Q. Which of the following metals is most likely to undergo oxidation in a redox reaction?
A.
Gold
B.
Platinum
C.
Silver
D.
Sodium
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Solution
Sodium is highly reactive and readily undergoes oxidation due to its low ionization energy.
Correct Answer:
D
— Sodium
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Q. Which of the following processes is used to extract metals from their ores using heat and a reducing agent?
A.
Electrolysis
B.
Roasting
C.
Smelting
D.
Leaching
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Solution
Smelting is the process of extracting metals from their ores by heating and using a reducing agent.
Correct Answer:
C
— Smelting
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Showing 1 to 16 of 16 (1 Pages)
The General Principles of Metallurgy section deals with the extraction, purification, and refining of metals from their ores, forming a crucial part of Class 11–12 and undergraduate Inorganic Chemistry . This module is designed for school students, undergraduate learners, and competitive exam aspirants , with strong emphasis on conceptual understanding, process logic, and exam relevance .
In this section, you will study:
Occurrence of metals – minerals and ores, concentration of ores
Extraction principles – thermodynamic feasibility, Gibbs free energy (Ellingham diagram)
Concentration of ores – hydraulic washing, magnetic separation, froth flotation
Roasting and calcination – purpose, reactions, and comparison
Reduction methods – carbon reduction, self-reduction, aluminothermy, and electrolytic reduction
Refining of metals – electrolytic refining, zone refining, distillation, and liquation
Role of flux and slag in metallurgy
Extraction of important metals (overview) – iron, copper, aluminum, zinc
Environmental and economic aspects of metallurgical processes
NCERT- and UG-aligned explanations , supported by flowcharts, diagrams, reaction equations, MCQs, numericals, and PYQs
The content is structured to build step-by-step understanding , strengthen process-based reasoning , and help students confidently tackle theoretical and application-based questions in exams.
Develop a strong foundation in the General Principles of Metallurgy to master metal extraction logic , a high-weightage topic in NEET, JEE, and undergraduate examinations .
