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Home/ Chemistry/Chemistry MCQ with Answer Explanation : Metallurgical Processes.

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On: October 13, 2024 Posted in Chemistry, Education, Exam Comments: 0 Views: 227

Chemistry MCQ with Answer Explanation : Metallurgical Processes.

Here below some basic MCQ’s about “Metallurgical Processes” with answer explanation for exam practice. Let’s check one by one which is given below.

Question 1:

Which of the following processes is used for the extraction of aluminum from its ore?

A) Electrolytic reduction
B) Pyrometallurgical reduction
C) Hydrometallurgical process
D) Carbon reduction

Answer: A) Electrolytic reduction

Explanation: Aluminum is primarily extracted from bauxite ore through the Hall-Héroult process, which involves electrolytic reduction. In this process, aluminum oxide (Al2O3) is dissolved in molten cryolite (Na3AlF6) and subjected to an electric current, causing aluminum to deposit at the cathode.

Question 2:

Which of the following is a primary method for purifying copper?

A) Roasting
B) Electrolysis
C) Distillation
D) Filtration

Answer: B) Electrolysis

Explanation: Electrolysis is used to purify copper. In this process, impure copper is used as the anode and pure copper is deposited at the cathode from an electrolyte solution of copper sulfate. This method efficiently removes impurities from the copper.

Question 3:

The process of smelting primarily involves which of the following?

A) Heating ore in the presence of a reducing agent
B) Dissolving ore in an acid
C) Mechanical separation of minerals
D) Heating ore with oxygen

Answer: A) Heating ore in the presence of a reducing agent

Explanation: Smelting is a pyrometallurgical process where ore is heated in the presence of a reducing agent (such as carbon) to extract the metal. This process helps to separate the metal from its oxide or sulfide.

Question 4:

What is the main purpose of using flux in metallurgical processes?

A) To increase the melting point of metals
B) To remove impurities from metals
C) To cool down molten metal
D) To enhance the color of metals

Answer: B) To remove impurities from metals

Explanation: Flux is added during metallurgical processes to facilitate the removal of impurities. It combines with unwanted materials to form a slag, which can be easily separated from the molten metal.

Question 5:

Which of the following is an example of hydrometallurgy?

A) Blast furnace operation
B) Leaching
C) Sintering
D) Calcination

Answer: B) Leaching

Explanation: Hydrometallurgy refers to the extraction of metals from ores using aqueous solutions. Leaching is a process where solvents are used to dissolve metals from their ores, making it a prime example of hydrometallurgy.

Question 6:

What is the primary component of the ore hematite?

A) Copper
B) Iron
C) Aluminum
D) Zinc

Answer: B) Iron

Explanation: Hematite is an iron oxide mineral (Fe2O3) and is one of the primary ores of iron used in metallurgical processes for the extraction of iron.

Question 7:

Which of the following methods is used for the extraction of silver?

A) Pyrometallurgy
B) Electrorefining
C) Amalgamation
D) Sintering

Answer: C) Amalgamation

Explanation: Amalgamation is a process used to extract silver (and gold) by mixing the metal with mercury, forming an amalgam which can then be heated to separate the pure metal from mercury.

Question 8:

Which of the following is a common reducing agent in metallurgical processes?

A) Oxygen
B) Nitrogen
C) Carbon
D) Hydrogen

Answer: C) Carbon

Explanation: Carbon is frequently used as a reducing agent in smelting processes to reduce metal oxides to their elemental form, particularly in the extraction of iron from iron ore.

Question 9:

What is the main purpose of the roasting process in metallurgy?

A) To melt metals
B) To concentrate ores
C) To oxidize sulfide ores
D) To purify metals

Answer: C) To oxidize sulfide ores

Explanation: Roasting involves heating sulfide ores in the presence of oxygen to convert them into oxides, which can then be reduced to extract the metal.

Question 10:

What is the purpose of sintering in metallurgical processes?

A) To melt metals
B) To form porous pellets from powdered ore
C) To separate impurities
D) To increase the ductility of metals

Answer: B) To form porous pellets from powdered ore

Explanation: Sintering is a process where powdered materials are heated below their melting point to fuse particles together, forming porous pellets that can be used in subsequent metallurgical operations.

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