Question 31:
What type of reaction occurs during the reduction of iron oxide in a blast furnace?
A) Exothermic
B) Endothermic
C) Photochemical
D) Electrochemical
Answer: A) Exothermic
Explanation: The reduction of iron oxide in a blast furnace is an exothermic reaction, releasing heat and facilitating the smelting process.
Question 32:
Which of the following metals can be extracted by the carbon reduction method?
A) Gold
B) Aluminum
C) Iron
D) Sodium
Answer: C) Iron
Explanation: Iron is typically extracted from its ore through carbon reduction in a blast furnace, where carbon reduces iron oxide to iron.
Question 33:
What is “electrorefining”?
A) A method for smelting metals
B) A method for purifying metals using electricity
C) A technique for alloying metals
D) A method for leaching metals from ores
Answer: B) A method for purifying metals using electricity
Explanation: Electrorefining is a process where an impure metal is dissolved in an electrolyte and deposited as pure metal at the cathode through electrolysis.
Question 34:
Which of the following metals is typically extracted using the froth flotation process?
A) Aluminum
B) Iron
C) Copper
D) Lead
Answer: C) Copper
Explanation: Froth flotation is commonly used to concentrate copper ores by exploiting differences in hydrophobic properties of the minerals.
Question 35:
What is the main environmental concern associated with mining activities?
A) Increased biodiversity
B) Air pollution
C) Soil erosion
D) Water pollution
Answer: D) Water pollution
Explanation: Mining activities can lead to water pollution through runoff of heavy metals and other contaminants, affecting surrounding ecosystems and water supplies.
Question 36:
What is the main purpose of using a carbon electrode in the electrolysis of aluminum oxide?
A) To provide a source of heat
B) To act as a reducing agent
C) To complete the electric circuit
D) To collect impurities
Answer: B) To act as a reducing agent
Explanation: In the electrolysis of aluminum oxide, the carbon electrode helps reduce aluminum ions to aluminum metal at the cathode.
Question 37:
Which of the following is a common application of titanium?
A) Construction
B) Jewelry
C) Aerospace components
D) Food packaging
Answer: C) Aerospace components
Explanation: Titanium is widely used in aerospace applications due to its high strength-to-weight ratio and corrosion resistance.
Question 38:
Which metallurgical technique involves heating metal ores with a flux and a reducing agent?
A) Sintering
B) Smelting
C) Roasting
D) Calcination
Answer: B) Smelting
Explanation: Smelting is the process where ores are heated with a flux and a reducing agent, allowing for the extraction of the metal from its ore.
Question 39:
What is the term for the process of converting iron into steel?
A) Alloying
B) Tempering
C) Hardening
D) Steelmaking
Answer: D) Steelmaking
Explanation: Steelmaking refers to the processes used to convert iron into steel by controlling the carbon content and adding other alloying elements.
Question 40:
Which of the following is NOT a characteristic of non-ferrous metals?
A) Generally lower density than ferrous metals
B) Resistance to corrosion
C) Magnetic properties
D) High electrical conductivity
Answer: C) Magnetic properties
Explanation: Non-ferrous metals typically lack magnetic properties, which is a distinguishing characteristic from ferrous metals that contain iron.
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