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Essential Chemistry for IGCSE - Electricity And Chemistry (Section 2)

1
In the chlor-alkali process, what substance is produced at the cathode?
Answer
(B)
Hydrogen gas
2
What is a key application of electroplating in industry?
Answer
(C)
To prevent corrosion.
3
What is the purpose of adding a salt to water during electrolysis?
Answer
(A)
To increase the water's conductivity
4
In the electrolytic refining of copper, which substances are involved in the reactions at the electrodes?
Answer
A
C
5
What are the main uses of insulators?
Answer
A
B
C
6
Which of these processes can be explained by the use of electrolysis?
Answer
(B)
Purification of copper
7
Which of the following gases is produced at the carbon anodes during the electrolysis of alumina?
Answer
(C)
Carbon Dioxide
8
During the electrolysis of water, the cathode is the site where:
Answer
(B)
Hydrogen gas is produced
9
When electroplating, the object to be plated is generally connected to the ________ terminal of the power supply.
Answer
(B)
Negative
10
Which of the following is a benefit of electroplating a metal object?
Answer
(C)
To improve its appearance or resistance to corrosion.
11
What is the purpose of the electrolyte in an electrolytic cell?
Answer
(A)
To conduct electricity
12
Why are thick wires used in high-voltage power lines?
Answer
(B)
To carry a larger electric current more safely.
13
In the electrolysis of a copper sulfate solution, what are the products at the anode and cathode, respectively, if inert electrodes are used?
Answer
(C)
Oxygen and Hydrogen
14
What is the function of the carbon lining in the steel electrolysis cell used to extract aluminium?
Answer
(B)
To act as the cathode.
15
What is the main advantage of using aluminium cables in high voltage power lines?
Answer
(B)
Low weight and good conductivity.
16
What is the primary product formed at the anode during the electrolysis of concentrated aqueous sodium chloride?
Answer
(B)
Chlorine gas
17
What is the purpose of using an inert electrode during electrolysis?
Answer
(B)
To prevent the electrode from reacting
18
In the process of extracting aluminum, what is the purpose of heating bauxite with sodium hydroxide?
Answer
(B)
To convert aluminum oxide to sodium aluminate.
19
In the process of purifying copper, what is the main role of the impure copper electrode?
Answer
(B)
To be the anode where the copper dissolves and impurities fall to the bottom.
20
What is a common application of electrolysis?
Answer
(B)
To electroplate metals
21
Which of the following processes is used to purify aluminium?
Answer
(B)
Electrolysis.
22
If a student is electroplating a spoon with silver, which of the following should be the anode?
Answer
(B)
The silver metal
23
What happens at the anode during the electrolysis of copper (II) sulfate solution using inert electrodes?
Answer
(B)
Oxygen gas is produced.
24
What is the name given to the reaction that occurs at the cathode during electrolysis?
Answer
(B)
Reduction
25
Which of the following is an advantage of using steel-cored aluminum cables in high-voltage power lines?
Answer
(B)
High Strength.
26
Which of the following substances will cause a positive electrode (anode) to erode during the electrolysis of a copper(II) sulfate solution?
Answer
(C)
Copper
27
Which is the electrode where oxidation takes place in an electrolytic cell?
Answer
(A)
Anode
28
In electrolysis, the electrode where reduction occurs is known as the:
Answer
(B)
Cathode
29
What is the primary function of the steel core within the aluminum cables used in high voltage power lines?
Answer
(B)
To strengthen the cable.
30
During electrolysis, the electrical current causes:
Answer
(B)
A chemical reaction
31
In the electrolysis of copper sulfate solution with copper electrodes, which statement is correct?
Answer
(C)
The concentration of copper(II) ions in the solution remains constant.
32
Which of the following is the main impurity found in bauxite, the ore from which aluminum is extracted?
Answer
(A)
Iron oxide
33
In the industrial production of sodium hydroxide, which of the following is the main product formed at the cathode?
Answer
(B)
Hydrogen gas
34
Which of the following are considered good insulators?
Answer
A
C
35
In electroplating, which electrode does the object to be plated function as?
Answer
(B)
Cathode
36
What are some key components of an electrolytic cell?
Answer
A
B
C
37
What materials are commonly used for inert electrodes in electrolysis?
Answer
B
C
38
Which of the following statements is correct regarding conductors?
Answer
(C)
Conductors allow electricity to flow easily.
39
What type of metal is used in the process of electroplating?
Answer
(D)
A metal with good conductivity
40
What happens during electroplating?
Answer
B
C
41
What is formed at the anode during the electrolysis of concentrated hydrochloric acid?
Answer
(A)
Chlorine
42
During the electrolysis of molten sodium chloride, what is the charge on the sodium ions?
Answer
(A)
+1
43
What is the overall purpose of electroplating an object?
Answer
(D)
To improve appearance and/or resistance to corrosion
44
Which process is used to purify copper?
Answer
(B)
Electrolysis with copper electrodes
45
What is the key process that allows electroplating to work?
Answer
(B)
Reduction of the metal ions
46
In electrical wiring, which type of material is commonly used to conduct electricity?
Answer
(C)
Copper
47
Which process improves the appearance and corrosion resistance of metals?
Answer
(C)
Electroplating
48
If you were to electroplate a metal spoon with silver, which material should the electrode that supplies the silver come from?
Answer
(A)
Silver metal
49
What are the main products of the electrolysis of concentrated sodium chloride solution (brine)?
Answer
(C)
Sodium hydroxide, hydrogen and chlorine
50
Which of the following materials are commonly used to make electrodes?
Answer
A
B
D