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Essential Chemistry for IGCSE - Metal Extraction (Section 5)

1
What is the main function of a blast furnace?
Answer
(C)
To extract iron from iron ore.
2
What process is used to create steel from pig iron?
Answer
(C)
Basic oxygen converter
3
What is the role of the slag in the blast furnace?
Answer
(B)
To remove impurities.
4
What is the role of oxygen in the basic oxygen steelmaking process?
Answer
(A)
To react with impurities and remove them.
5
Which of the following statement(s) about recycling is correct?
Answer
A
B
D
6
What is the name of the process used to refine pig iron into steel?
Answer
(C)
Basic oxygen process
7
What is the purpose of adding oxygen to the molten iron in the basic oxygen converter?
Answer
(B)
To remove carbon and other impurities.
8
Which of the following is a common ore of iron?
Answer
(C)
Hematite
9
Which of the following is a common alloying element used in steel?
Answer
(C)
Chromium
10
What is the term for a substance added to the molten metal to remove impurities and form a layer called slag?
Answer
(A)
Flux
11
What is the by-product that is produced when carbon reacts with oxygen in the blast furnace?
Answer
(D)
Carbon dioxide
12
What is the name of the compound formed when iron rusts?
Answer
(B)
Fe2O3
13
In the extraction of metals, what does the term 'ore' refer to?
Answer
(C)
A rock or mineral containing enough of a metal to be extracted profitably.
14
What type of steel is resistant to corrosion?
Answer
(C)
Stainless steel
15
In the steelmaking process, which of the following is used to remove carbon from the molten iron?
Answer
(B)
Oxygen
16
Which substance is used to remove sulfur impurities during steel making?
Answer
(D)
Limestone
17
What are the main advantages of using alloys?
Answer
A
B
C
18
What type of process is used to produce steel from pig iron?
Answer
(C)
Basic oxygen process
19
Which metal is typically extracted from its ore by roasting and then reduction with carbon?
Answer
(C)
Zinc
20
What are some of the key materials used in a blast furnace?
Answer
A
B
C
21
What is the primary purpose of limestone (calcium carbonate) in the blast furnace?
Answer
(B)
To remove impurities.
22
What is the main purpose of alloying elements in steel?
Answer
(C)
To improve its properties.
23
What is the role of the air blown into the bottom of the blast furnace?
Answer
(A)
To help coke burn and produce heat.
24
What are the major advantages of recycling metals?
Answer
A
B
D
25
In the extraction of zinc, what is the role of the zinc sulfide ore?
Answer
(B)
It is converted to zinc oxide.
26
Why is carbon often used as a reducing agent in metal extraction?
Answer
(C)
It readily loses electrons.
27
In the extraction of zinc, the zinc blende (zinc sulfide) is initially processed by:
Answer
(B)
Roasting in air
28
Which metal is NOT commonly used to make an alloy?
Answer
(D)
Sodium
29
Which of the following is a common use of aluminum?
Answer
(B)
Making cooking utensils
30
What is the role of carbon dioxide during the extraction of zinc?
Answer
(A)
It is a product of the reduction.
31
Which of the following is the most reactive metal from the list below?
Answer
(B)
Sodium
32
What is added to the basic oxygen converter to improve the steel?
Answer
(C)
Alloying elements
33
Which of the following is an example of a common alloy?
Answer
(C)
Steel
34
Why is it necessary to remove impurities in the process of metal extraction?
Answer
(A)
To improve the properties of the metal.
35
Which of the following is the primary ore used for extracting aluminum?
Answer
(B)
Bauxite
36
What is a major advantage of using alloys?
Answer
(B)
They have different properties.
37
Which substance is added to the steel to make stainless steel?
Answer
(B)
Chromium
38
What is the main function of the oxygen blown into the basic oxygen converter?
Answer
(B)
To remove impurities.
39
Why is recycling metals advantageous?
Answer
A
B
C