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Essential Chemistry for IGCSE - Electricity And Chemistry (Section 1)

1
Which of the following is a practical application of electroplating?
Answer
A
B
2
What is the purpose of the steel core in high-voltage power lines containing aluminum cables?
Answer
(B)
To strengthen the cable.
3
What is the main reason for using aluminium in high-voltage power lines?
Answer
A
B
C
4
What is the name of the process used to extract aluminium from aluminium oxide?
Answer
(C)
Electrolysis
5
What happens to the carbon anodes during the electrolysis of molten aluminium oxide?
Answer
(A)
They get smaller.
6
Why is it important to keep the electrolyte at a high temperature for long periods of time during the electrolysis of aluminum oxide?
Answer
(B)
To maintain the molten state of the electrolyte.
7
Which of the following is a characteristic of insulators?
Answer
C
D
8
What process occurs at the cathode during the electrolysis of alumina?
Answer
(B)
Reduction of aluminium ions.
9
Which of the following processes is crucial for metal corrosion protection?
Answer
(A)
Electroplating
10
What is a common use of electroplating?
Answer
(B)
To protect metals from corrosion
11
What are the two primary components involved in a redox reaction during electrolysis?
Answer
(B)
Oxidation and reduction
12
What is the primary function of the electrolyte in electrolysis?
Answer
(B)
To conduct electricity through the solution.
13
Which type of material is typically used to insulate electrical wiring?
Answer
(C)
Plastic
14
Which of the following describes the function of a diaphragm in the chlor-alkali process?
Answer
(B)
To separate the chlorine gas from the sodium hydroxide solution.
15
Which gas is produced at the anode during the electrolysis of a copper(II) sulfate solution using inert electrodes?
Answer
(B)
Oxygen
16
Which substance is produced at the cathode during the electrolysis of acidified water?
Answer
(B)
Hydrogen
17
Which of the following are good conductors of electricity?
Answer
A
C
18
What is the chemical name for aluminum oxide?
Answer
(C)
Alumina
19
Which statement best describes the role of the electrolyte in electrolysis?
Answer
(B)
It provides the ions that carry the charge.
20
In the extraction of aluminium, which compound is added to the alumina to lower its melting point?
Answer
(C)
Cryolite
21
Which of the following materials is used to lower the melting point of alumina in the extraction process?
Answer
(C)
Cryolite
22
During the electrolysis of water, hydrogen gas is produced at which electrode?
Answer
(B)
Cathode
23
What factors influence which products are formed during electrolysis?
Answer
A
B
C
24
What is a common application of the electrolysis process?
Answer
(A)
Electroplating
25
What happens to the carbon anodes during the electrolysis of molten aluminum oxide?
Answer
A
C
26
When an aqueous solution of sodium chloride is electrolyzed, which of the following is produced at the anode?
Answer
(C)
Chlorine
27
What is the overall reaction that happens during the electrolysis of water?
Answer
(B)
2H2O → 2H2 + O2
28
In electroplating, what is the source of the metal ions that are deposited onto the object?
Answer
(A)
The electrolyte solution
29
What is the role of sodium hydroxide in the purification of bauxite?
Answer
(B)
To dissolve the aluminium oxide.
30
Which of the following is NOT an advantage of using aluminium in power lines?
Answer
(C)
It is very strong.
31
What are the two main electrodes in the electrolysis cell used to extract aluminium?
Answer
(D)
Carbon and Carbon
32
Which of the following materials is NOT a good electrical conductor?
Answer
(C)
Glass
33
Which of the following is the first step in the extraction of aluminum from bauxite ore?
Answer
(B)
Purifying the ore by reacting with sodium hydroxide.
34
What are the products formed when electrolyzing concentrated aqueous sodium chloride?
Answer
(B)
Hydrogen and Chlorine
35
What type of reaction occurs at the cathode during electrolysis?
Answer
(B)
Reduction
36
Which of the following statements correctly describes the process at the cathode during the electrolysis of aluminum oxide?
Answer
(B)
Aluminum ions gain electrons and are reduced.
37
Which of the following is NOT required for electrolysis to occur?
Answer
(C)
A catalyst
38
What is produced at the cathode during the electrolysis of acidified water (water with a little sulfuric acid added)?
Answer
(A)
Hydrogen
39
Which compound is used to lower the melting point of the electrolyte in the extraction process?
Answer
(C)
Cryolite
40
During electrolysis, where do electrons enter the electrolytic cell?
Answer
(B)
At the cathode
41
What substance, found in an aqueous solution, is involved in the reaction at the anode during electrolysis?
Answer
(A)
Anions
42
What happens to the mass of the cathode during the purification of copper?
Answer
(A)
Increases
43
What substances are often present in aqueous solutions used for electrolysis?
Answer
A
B
C
44
In the electrolysis of copper sulfate solution, what ions are present in the solution?
Answer
(A)
Cu2+ and SO42- ions
45
What is the role of the carbon lining in the electrolytic cell used for aluminium extraction?
Answer
(B)
To act as the cathode.
46
What is the electrolyte in the electrolysis of molten lead(II) bromide?
Answer
(C)
Lead(II) bromide
47
When electroplating with silver, where do the silver ions come from that are deposited?
Answer
(B)
The silver anode.
48
What are some materials commonly used as electrodes in electrolysis?
Answer
A
C
D
49
What type of electrochemical reaction occurs at the anode?
Answer
(B)
Oxidation
50
Which of the following statements are true about electrolysis?
Answer
A
B