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Essential Chemistry for IGCSE - Metal Extraction (Section 3)

1
Which of the following methods can be used for extracting metals from their ores?
Answer
A
B
C
2
In the zinc extraction process, zinc oxide is converted to zinc by reacting with which reducing agent?
Answer
(B)
Carbon monoxide
3
In addition to Chromium, which other element is crucial to make stainless steel?
Answer
(A)
Nickel
4
What are some of the uses of low-carbon steel?
Answer
A
B
C
5
What type of furnace is mainly used to produce steel from iron?
Answer
(C)
Basic oxygen converter
6
What is the main purpose of using oxygen in the basic oxygen converter?
Answer
(B)
To remove carbon and other impurities from the iron.
7
What are some benefits of using alloys instead of pure metals?
Answer
A
B
8
Which of the following are uses for stainless steel?
Answer
A
B
D
9
Which of the following metals is usually obtained by electrolysis?
Answer
A
B
D
10
What is the main purpose of adding silicon to steel?
Answer
(B)
To increase hardness and strength.
11
What is the role of the slag in the extraction of iron?
Answer
(B)
To remove impurities
12
The efficiency of a blast furnace is enhanced by:
Answer
(B)
Heating the air blown into the furnace.
13
What process is used to make steel from iron by removing carbon and other impurities?
Answer
(C)
Basic Oxygen Process
14
Which of the following ores is predominantly used in the extraction of zinc?
Answer
(C)
Sphalerite
15
What is the primary function of adding limestone to the blast furnace?
Answer
(B)
To remove impurities as slag.
16
What are some of the advantages of using aluminum?
Answer
A
C
D
17
What is the primary method used to obtain metals from their ores?
Answer
(C)
Chemical reduction
18
Which of the following is the main reason for adding manganese to steel?
Answer
(A)
Increase hardness and strength.
19
Which of the following chemical processes is central to the extraction of metals from their ores?
Answer
(B)
Reduction
20
Which process is essential for converting iron into steel, primarily removing carbon?
Answer
(C)
The Basic Oxygen Process
21
What is the main environmental benefit of recycling metals?
Answer
(A)
Reduced landfill waste.
22
Why are stainless steels resistant to corrosion?
Answer
(C)
They contain chromium.
23
What is the purpose of adding air to the blast furnace at the bottom?
Answer
(A)
To increase the temperature.
24
What is the purpose of limestone in the zinc extraction process?
Answer
(C)
To act as a flux and remove impurities.
25
Which of the following best describes the term 'alloy'?
Answer
(B)
A mixture of metals or a metal with other elements.
26
What is the main purpose of the basic oxygen process?
Answer
(B)
To refine iron into steel.
27
What are the primary components required for the basic oxygen process?
Answer
A
B
C
28
In the context of metal extraction, what is the role of carbon monoxide?
Answer
(A)
It is a reducing agent.
29
In the zinc extraction process, what is the temperature at which zinc oxide is heated with carbon?
Answer
(B)
Around 1000°C
30
What is the function of carbon in the extraction of zinc from zinc oxide?
Answer
(D)
To reduce the zinc oxide.
31
In steelmaking, what is the purpose of adding manganese?
Answer
(B)
To increase the hardness.
32
Which of the following describes the function of the flux in metal extraction?
Answer
(A)
To remove impurities
33
What process is used to obtain pure zinc from the impure zinc produced in the initial smelting process?
Answer
(B)
Distillation
34
Which of the following is a product of a blast furnace?
Answer
(B)
Slag
35
What is the name of the process used to extract aluminum?
Answer
(A)
Electrolysis
36
Which of the following elements is added to steel to make stainless steel?
Answer
(C)
Chromium
37
Which of the following metals is extracted using electrolysis?
Answer
(C)
Aluminum
38
In the steelmaking process, what is the role of oxygen?
Answer
(A)
To remove carbon and other impurities.
39
Why is electrolysis used to extract aluminum?
Answer
(A)
Aluminum is very reactive, so it cannot be extracted by reduction with carbon.
40
Which of the following is a primary component of slag formed in a blast furnace?
Answer
(C)
Calcium silicate
41
Which of the following best describes an alloy?
Answer
(D)
Both B and C
42
Why does the presence of impurities affect the properties of steel?
Answer
(C)
Impurities cause defects and weaken steel.
43
What are the main components used in the blast furnace?
Answer
A
B
C
44
In the context of metal extraction, what does 'roasting' refer to?
Answer
(B)
Heating an ore in air.
45
What does 'reducing agent' do in the metal extraction process?
Answer
(B)
It removes oxygen from the ore.
46
What is the primary role of the 'slag' produced in the blast furnace?
Answer
(B)
To help remove impurities.
47
Which metal is a good conductor and used in the manufacture of electrical wiring?
Answer
(C)
Copper
48
What is the chemical formula of hematite?
Answer
(B)
Fe2O3
49
During the extraction of zinc from zinc blende, what gas is released during roasting?
Answer
(B)
Sulfur dioxide
50
Which of the following are used as raw materials in the extraction of zinc?
Answer
A
B
C