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Essential Chemistry for IGCSE - Metals And Reactivity (Section 2)

1
What happens to a metal when it forms an alloy?
Answer
(B)
Its properties may be altered.
2
Why does aluminium seem unreactive despite being very reactive?
Answer
(B)
Protective oxide layer.
3
Which of the following is a characteristic of a displacement reaction?
Answer
(C)
A more reactive metal replaces a less reactive metal.
4
Which statements are true regarding a more reactive metal and a less reactive metal in a displacement reaction?
Answer
(A)
The more reactive metal is oxidized.
5
Which products are formed when calcium carbonate is heated?
Answer
(B)
Calcium oxide and carbon dioxide
6
What are some key characteristics of a displacement reaction?
Answer
A
B
7
Which conditions are typically required for the rusting of iron?
Answer
A
B
C
8
What type of reaction occurs when a more reactive metal replaces a less reactive metal from a solution of its salt?
Answer
(C)
Displacement
9
In the thermite reaction, what type of agent is aluminium?
Answer
(B)
A reducing agent.
10
What are the key features of an electrochemical series (metal reactivity series)?
Answer
A
B
C
11
Which of the following statements are true about a more reactive metal displacing a less reactive metal?
Answer
A
C
12
Which term is used for a chemical reaction that involves electron transfer?
Answer
(B)
Redox
13
What property of metals is demonstrated by their reaction with acids?
Answer
(C)
Their reactivity.
14
Which of the following metal oxides will be reduced by carbon?
Answer
(B)
Copper(II) oxide
15
What gas is always produced when an active metal reacts with dilute hydrochloric acid?
Answer
(C)
Hydrogen
16
What happens to the more reactive metal and the less reactive metal in a displacement reaction?
Answer
(A)
The more reactive metal is oxidized.
17
Which metal is the least reactive in the reactivity series below?
Answer
(C)
Copper
18
What is meant by thermal decomposition?
Answer
(C)
The breakdown of a substance by heating.
19
In the reactivity series, where is copper typically located?
Answer
(C)
At the bottom of the series
20
Which statements are true about thermal decomposition?
Answer
A
B
D
21
Which are key for the rusting process?
Answer
A
B
C
22
What is the term used to describe a chemical reaction involving the transfer of electrons?
Answer
(C)
Redox
23
Which of the following is an example of a redox reaction?
Answer
(C)
Displacement
24
In the reaction between copper and oxygen, which of the following statements is true?
Answer
A
D
25
Which of the following statements about the thermal decomposition of metal nitrates is/are correct?
Answer
B
D
26
In the thermite reaction, what substance acts as the reducing agent?
Answer
(B)
Aluminium
27
Why are alloys generally harder and stronger than pure metals?
Answer
(B)
The different sized atoms in an alloy disrupt the regular arrangement of atoms, making it more difficult for layers to slide over each other.
28
Based on the reactivity series, which metal will react most vigorously with dilute hydrochloric acid?
Answer
(B)
Zinc
29
Which of the following reactions is not an example of displacement reaction?
Answer
(B)
A less reactive metal replacing a more reactive metal from its salt solution.
30
When a metal reacts with oxygen, what is formed?
Answer
(C)
An oxide
31
Which of the following statements are true about the reactivity series?
Answer
A
B
D
32
Which statements about displacement reactions are correct?
Answer
A
C
33
What are the key reactants that lead to the rusting of iron?
Answer
(D)
Iron, water, and oxygen
34
What are the products of the thermal decomposition of copper(II) carbonate?
Answer
(B)
Copper oxide and carbon dioxide
35
In the 'thermite' reaction, which substance is oxidized?
Answer
(B)
Aluminium
36
During metal extraction using carbon, what is the function of carbon?
Answer
(B)
To reduce the metal oxide.
37
What is the main purpose of combining different metals to form an alloy?
Answer
(C)
To create materials with improved properties.
38
Which statement correctly defines an oxidation-reduction (redox) reaction?
Answer
(A)
A reaction involving the transfer of electrons.
39
What is the key to the apparent lack of reactivity of aluminium?
Answer
(B)
The formation of a thin, protective oxide layer.
40
What are the key requirements for the rusting of iron to take place?
Answer
A
B
C
41
What is the underlying reason metals tend to be reactive?
Answer
(B)
Their ease of losing electrons.
42
What is formed when calcium carbonate (CaCO3) undergoes thermal decomposition?
Answer
(B)
Calcium oxide and carbon dioxide
43
In the extraction of metals, what is the function of carbon?
Answer
(A)
To remove oxygen from metal oxides.
44
What are the usual products when copper(II) carbonate is heated?
Answer
(B)
Copper(II) oxide and carbon dioxide
45
Which of the following are essential for the process of rusting to occur?
Answer
A
B
46
Which type of chemical reaction is represented by the thermite reaction?
Answer
(C)
Redox
47
Which statements correctly describe thermal decomposition?
Answer
A
B
D
48
In a displacement reaction, what happens to the less reactive metal?
Answer
B
C
49
Based on the reactivity series, which metal will displace copper from a solution of copper(II) sulfate?
Answer
(C)
Iron
50
What role does carbon play in the extraction of metals from their oxides?
Answer
(B)
It acts as a reducing agent.