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Essential Chemistry for IGCSE - Electricity And Chemistry (Section 4)

1
What is the role of the object being plated in electroplating?
Answer
(B)
It is the cathode
2
Which of the following is a good conductor of electricity?
Answer
B
C
3
During the electrolysis of dilute hydrochloric acid, what gas is evolved at the anode?
Answer
(B)
Chlorine
4
What is the chemical formula of alumina?
Answer
(B)
Al2O3
5
Which of the following is a characteristic of thick wires compared to thin wires?
Answer
(B)
Thick wires carry a larger electric current more safely.
6
What is the main industrial use of electrolysis?
Answer
(B)
To purify metals and manufacture various substances
7
Which of the following is a characteristic of the anode in an electrolytic cell?
Answer
A
C
8
During the electrolysis of copper(II) sulfate solution using copper electrodes, what happens at the cathode?
Answer
(C)
Copper is deposited onto the cathode.
9
In the electrolysis of a solution containing Cu2+ ions, what will happen if the cathode is a copper electrode?
Answer
(C)
Copper will be deposited on the cathode.
10
Which of the following is a use of electrolysis?
Answer
(B)
Electroplating
11
In the electroplating process, where does the plating metal come from?
Answer
(B)
The anode
12
Which of these are uses of electroplating?
Answer
A
B
D
13
What are the products formed in the electrolysis of water?
Answer
(B)
Hydrogen and Oxygen
14
Which of the following is true regarding the electrolyte solution?
Answer
A
B
D
15
What happens to the copper anode during electrolysis of copper sulfate solution with copper electrodes?
Answer
A
C
D
16
The use of electricity to drive a non-spontaneous chemical reaction is referred to as:
Answer
(C)
Electrolysis
17
Which of the following are key components of the electroplating process?
Answer
A
B
C
18
If copper is purified using electrolysis, which electrode would be the impure copper?
Answer
(A)
Anode
19
What happens to copper during the electrolysis of copper sulfate solution with copper electrodes?
Answer
(D)
Copper ions in the solution are deposited at the cathode.
20
What type of material is used for the anode in electrolysis of a copper sulfate solution to purify copper?
Answer
(C)
An impure copper electrode
21
What is the role of the cathode in the extraction of aluminum through electrolysis?
Answer
(B)
To reduce aluminum ions.
22
What is produced at the anode during the electrolysis of molten lead(II) bromide?
Answer
(B)
Bromine
23
What will be produced at the cathode during the electrolysis of a copper(II) sulfate solution using copper electrodes?
Answer
(A)
Copper
24
In the chlor-alkali process, what is the name of the solution which is produced?
Answer
(C)
Sodium hydroxide
25
In the chlor-alkali process, which gas is a byproduct, and what is the main product?
Answer
(A)
Hydrogen, Chlorine
26
Which ion is responsible for carrying current during the electrolysis of aqueous solutions?
Answer
(D)
All of the above
27
Which of the following statements is true regarding electroplating?
Answer
B
C
28
What happens to the concentration of copper(II) ions in a copper sulfate solution when copper electrodes are used for electrolysis?
Answer
(C)
Remains constant
29
What type of reaction occurs at the cathode during the electrolysis of a solution?
Answer
(B)
Reduction
30
Which of the following statements are true about electrolysis of copper(II) sulfate solution using inert electrodes?
Answer
A
B
31
Which of the following is the electrolyte used during the extraction of aluminum?
Answer
(C)
A solution of aluminum oxide in cryolite.
32
In the electrolysis of molten aluminum oxide, what is the role of the carbon anodes?
Answer
(D)
To react with the oxygen produced, forming carbon dioxide.
33
What is the purpose of electroplating an object with another metal?
Answer
(C)
To improve the object's appearance or corrosion resistance.
34
What process describes the breakdown of a substance using electricity?
Answer
(B)
Electrolysis
35
What are the products formed when electrolysing acidified water (with sulfuric acid added)?
Answer
A
B
36
Why is aluminium oxide dissolved in cryolite during electrolysis?
Answer
(B)
To save energy and improve the electrical conductivity.
37
What is the name given to the reaction that occurs at the anode during electrolysis?
Answer
(A)
Oxidation
38
Which gas is produced during the electrolysis of molten aluminum oxide at the anode?
Answer
(B)
Oxygen
39
What is the state of the aluminium obtained at the cathode?
Answer
(B)
Liquid
40
Which of the following is used to make the electrolyte for the extraction of aluminium?
Answer
(B)
Aluminium oxide and Cryolite
41
During the electrolysis of aluminium oxide, which ion is reduced?
Answer
(B)
Al³⁺
42
Which are typical uses of electroplating?
Answer
A
B
43
What is formed at the cathode during the electrolysis of molten lead(II) bromide?
Answer
(A)
Lead
44
What is the role of carbon in the extraction of aluminum?
Answer
B
C
45
In the extraction of aluminium, what is formed at the cathode?
Answer
(B)
Molten aluminium
46
What is the purpose of the liquid aluminium that forms at the bottom of the electrolytic cell?
Answer
(C)
To collect the aluminium product.
47
Which of the following are factors that can impact the outcome of electrolysis?
Answer
A
B
C
D
48
Which chemical reaction occurs at the anode during electrolysis?
Answer
(B)
Oxidation
49
What is the purpose of the siphon tube in the electrolytic cell used for aluminum extraction?
Answer
(B)
To remove the molten aluminum.
50
What are the main components used to make up steel-cored aluminium cables?
Answer
A
C