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Essential Chemistry for IGCSE - Metals And Reactivity (Section 3)

1
What are the products formed when copper(II) carbonate is heated strongly?
Answer
(B)
Copper oxide and carbon dioxide
2
Which gas is produced when zinc reacts with dilute sulfuric acid?
Answer
(C)
Hydrogen
3
Which of the following reactions is classified as a redox reaction?
Answer
(C)
Oxidation-Reduction.
4
Which of the following processes always involves breaking down a substance by heating?
Answer
(B)
Decomposition
5
Which statements are true regarding displacement reactions?
Answer
A
B
6
What general type of reaction occurs when a metal carbonate is heated?
Answer
(B)
Decomposition
7
In the reactivity series, where is copper usually situated?
Answer
(C)
At the bottom.
8
Why are some metals more reactive than others?
Answer
(B)
Their ability to easily lose electrons.
9
What is one of the main benefits of using alloys?
Answer
(C)
To enhance specific properties like strength.
10
Which of the following correctly describes the formation of rust?
Answer
A
B
11
What is the advantage of using alloys instead of pure metals in many applications?
Answer
(C)
Alloys often have improved properties such as strength and corrosion resistance.
12
Which chemical process takes place during the rusting of iron?
Answer
(C)
Oxidation
13
Which statements are correct about redox reactions?
Answer
A
B
14
What is the general outcome when a metal carbonate undergoes thermal decomposition?
Answer
(B)
Metal oxide and carbon dioxide are produced.
15
What happens during a displacement reaction?
Answer
(B)
An element replaces another element in a compound.
16
What is the typical gaseous product when a reactive metal reacts with dilute hydrochloric acid?
Answer
(C)
Hydrogen
17
In the thermite reaction, what is the purpose of the aluminium powder?
Answer
(C)
To act as a reducing agent
18
What is the other product formed besides copper(II) oxide when copper(II) carbonate is heated?
Answer
(B)
Carbon dioxide
19
Which of the following observations would you expect to see when magnesium reacts with cold water?
Answer
(B)
Slow fizzing, and hydrogen gas produced.
20
Which of the following describes a displacement reaction?
Answer
(B)
One element replacing another
21
Which of the following describes a displacement reaction?
Answer
(B)
A reaction where an element replaces another in a compound.
22
In the thermite reaction, what is the role of the iron(III) oxide (Fe2O3)?
Answer
(C)
It is reduced.
23
What are the main reactants in the rusting of iron?
Answer
(D)
Iron and oxygen
24
What are the typical products of a metal reacting with dilute hydrochloric acid?
Answer
A
B
25
What is the primary reason for creating alloys?
Answer
(C)
To improve properties like strength and resistance to corrosion.
26
What are the products when copper(II) oxide is heated?
Answer
(D)
There is no decomposition
27
Which of the following is a characteristic of a redox reaction?
Answer
(A)
The transfer of electrons.
28
In the 'thermite' reaction, what is the role of iron(III) oxide (Fe2O3)?
Answer
(C)
It provides the oxygen to oxidize the aluminium.
29
Why is aluminium relatively unreactive, even though it is a reactive metal?
Answer
(B)
Protective oxide layer
30
Which of the following factors affects the thermal stability of metal carbonates?
Answer
(A)
The size of the metal ion.
31
What is the key reason aluminium appears unreactive despite being a highly reactive metal?
Answer
(B)
The presence of a protective oxide layer.
32
Why is aluminium relatively unreactive, despite being a highly reactive metal?
Answer
(B)
A protective oxide layer forms on its surface.
33
Which of the following are products of the reaction between a metal and a dilute acid?
Answer
A
B
34
Which factor primarily determines how reactive a metal is?
Answer
(B)
The metal's ability to lose electrons easily.
35
Which gas is produced when magnesium reacts with dilute hydrochloric acid?
Answer
(C)
Hydrogen
36
Which of the following statements about the reactivity series is true?
Answer
A
B
C
37
What is the formula of the oxide layer that forms on the surface of aluminium, making it appear unreactive?
Answer
(B)
Al2O3
38
Which metal listed is the least reactive?
Answer
(C)
Copper
39
In the reactivity series, where is copper usually located?
Answer
(C)
At the bottom
40
Which of the following statements are true regarding the metal reactivity series?
Answer
A
C
D
41
What is carbon typically used for in metal extraction?
Answer
(B)
As a reducing agent.
42
Which of the following is an example of an alloy?
Answer
(C)
Steel
43
What gas is produced when magnesium reacts with dilute sulfuric acid?
Answer
(B)
Hydrogen
44
When a reactive metal reacts with dilute acid, what gas is usually released?
Answer
(C)
Hydrogen
45
What is the purpose of the salt bridge in an electrochemical cell?
Answer
(C)
To allow ions to flow to maintain electrical neutrality.
46
What happens to a metal when it is oxidized?
Answer
(C)
It loses electrons and becomes more reactive.
47
What is the main benefit of using alloys in place of pure metals?
Answer
(C)
They typically have enhanced properties.
48
Based on the reactivity series, which of these metals would be the most reactive?
Answer
(C)
Magnesium
49
Which of the following metal carbonates decomposes upon heating to produce carbon dioxide gas?
Answer
(C)
Lithium carbonate
50
Which substance is essential for rusting to occur?
Answer
(B)
Water and oxygen