Sign In

Essential Chemistry for IGCSE - Air And Water (Section 4)

1
Which of the following is/are a source(s) of nitrogen oxides (NOx)?
Answer
A
B
C
2
What happens as a result of global warming?
Answer
(C)
More extreme weather events.
3
What is the most dangerous aspect of incomplete combustion of fuels?
Answer
(A)
Production of carbon monoxide.
4
Which is a source of pollutants?
Answer
(B)
Vehicles
5
Which of the following is released in a catalytic converter?
Answer
(C)
Carbon dioxide
6
What is the role of electrolytes in the rusting process?
Answer
(C)
They speed up the rusting process.
7
What does the term 'sacrificial metal' mean in the context of preventing rust?
Answer
(B)
A metal that corrodes instead of the iron.
8
Which is not a source of air pollution?
Answer
(C)
Wind
9
Which of the following gases is a byproduct of the combustion process?
Answer
(C)
Carbon Dioxide
10
Where does the energy for photosynthesis come from?
Answer
(C)
Sunlight
11
What is the primary result of using a catalytic converter?
Answer
(C)
Reduction in air pollution
12
Which of the following is a greenhouse gas?
Answer
(B)
Methane.
13
Which are the products of respiration?
Answer
B
C
14
Which part of the sun's rays is responsible for global warming?
Answer
(B)
Infrared radiation
15
Which chemical(s) is/are the cause of acid rain?
Answer
B
C
16
Which of these is NOT a use for water in industry?
Answer
(C)
Food
17
Why does zinc corrode rather than the iron in galvanised steel?
Answer
(A)
Because zinc is more reactive than iron
18
What two pollutants are the primary cause of acid rain?
Answer
(B)
Sulfur dioxide and nitrogen oxides
19
What chemicals cause acid rain?
Answer
(C)
Sulfur dioxide and nitrogen oxides
20
Which gas makes up the majority of the air we breathe?
Answer
(C)
Nitrogen
21
What is the main source of energy in most organisms?
Answer
(C)
Glucose
22
Which of the following is a major use of water for industrial purposes?
Answer
(B)
Cooling
23
What is the main process used to separate oxygen from the air?
Answer
(B)
Distillation
24
Water is used in a variety of industrial processes. Which of the following is NOT a major application of water?
Answer
(C)
Drinking
25
Which types of radiations from the sun are absorbed by the earth's atmosphere before reaching the surface?
Answer
(B)
Ultraviolet radiation.
26
Which of the following is the primary function of water in agriculture?
Answer
(C)
Irrigation.
27
What gas contributes the most to acid rain?
Answer
(C)
Sulfur Dioxide
28
What is the primary function of aluminum sulfate in the water treatment process?
Answer
(C)
To cause small particles to clump together.
29
Which of the following gases reacts with water to form acid rain?
Answer
(C)
Sulfur dioxide
30
What process is used to separate oxygen and nitrogen from air based on their different boiling points?
Answer
(B)
Fractional Distillation
31
Which of the following is a cause of acid rain?
Answer
(A)
The burning of sulfur-containing fuels
32
What are the main pollutants contributing to air pollution?
Answer
A
B
C
33
In water treatment, what is the purpose of filtration?
Answer
(C)
To remove small particles and impurities.
34
What method is used to separate nitrogen and oxygen from the air?
Answer
(B)
Fractional distillation
35
Which of the following is a result of the greenhouse effect?
Answer
(B)
Warming of the Earth
36
What are the potential consequences that are related to global warming?
Answer
A
B
C
37
What is the main outcome of the 'burning of fossil fuels'?
Answer
(C)
It releases carbon dioxide into the atmosphere.
38
What type of coating is used on metal parts such as garden furniture?
Answer
(B)
Plastic coating
39
What is the main cause of the greenhouse effect?
Answer
(B)
Burning of fossil fuels
40
What is an example of a greenhouse gas?
Answer
(B)
Methane
41
What is a way that catalytic converters help reduce air pollution?
Answer
(C)
Converting dangerous nitrogen oxides into less harmful substances.
42
What is the main source of carbon dioxide emissions that contribute to global warming?
Answer
(B)
The burning of fossil fuels
43
What is a benefit of water treatment?
Answer
(B)
Making the water pure for drinking
44
What is the significance of the troposphere in the greenhouse effect?
Answer
(B)
It traps and holds heat close to the Earth's surface.
45
In the carbon cycle, what absorbs carbon dioxide from the atmosphere?
Answer
(B)
Plants
46
Which part of the Earth's atmosphere is responsible for trapping heat and contributing to the greenhouse effect?
Answer
(C)
Troposphere
47
Which gas is associated with the greenhouse effect?
Answer
(C)
Carbon dioxide
48
What is the purpose of coating iron or steel with a plastic layer in terms of rust prevention?
Answer
(C)
To exclude oxygen and water from reaching the metal.
49
What gas is essential for both respiration and combustion?
Answer
(A)
Oxygen
50
What does the text say are some of the causes of global warming?
Answer
A
C