11 mark
Which gas is present in the largest proportion in exhaust fumes of a car engine?
Carbon monoxide
Carbon dioxide
Water vapour
Nitrogen
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Syllabus Edition
First teaching 2023
First exams 2025
|
Nitrogen & Sulfur (CIE A Level Chemistry)
Exam Questions
2 hours27 questions
21 mark
Oxidation of ammonia by oxygen is the first step in the manufacture of nitric acid, which is used in the production of the synthetic material nylon.
wO2 (g) + xNH3 (g) format('truetype')%3Bfont-weight%3Anormal%3Bfont-style%3Anormal%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Ctext%20font-family%3D%22math12bba9f4124283edd644799e0ce%22%20font-size%3D%2216%22%20text-anchor%3D%22middle%22%20x%3D%2210.5%22%20y%3D%2216%22%3E%26%23x2192%3B%3C%2Ftext%3E%3C%2Fsvg%3E)
yNO (g) + zH2O (g)
Which values for w, x, y and z balance this equation?
|
w |
x |
y |
z |
|
|
A B C D |
5 6 6 5 |
4 4 5 6 |
4 4 5 6 |
6 5 4 4 |
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31 mark
Using your knowledge of the Bronsted-Lowry theory, which of the following correctly describes ammonia?
Neutral
Acid
Base
Amphoteric
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41 mark
Which statement correctly describes an ammonium ion, NH4+?
The bonds are all the same length.
All bond angles are 107°
Ammonium ions are unreactive when heated with NaOH (aq).
Ammonium ions are formed when ammonia behaves as an acid.
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51 mark
Which reaction that takes place in a catalytic converter does not remove hazardous and polluting gases from a car exhaust fumes?
CO + O2
CO2CO + NOx
CO2 + N2HC + NOx
H2O + CO2 + N2HC + NOx
H2O + CO + N2
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61 mark
The manufacture of ammonium nitrate NH4NO3, occurs on a large scale for use in fertiliser.
Which statement about ammonium nitrate fertiliser is not correct?
It is insoluble in water.
It consists of 35 % nitrogen by mass.
It can cause environmental problems.
Nitric acid is used in its manufacture.
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71 mark
Oxides of nitrogen are released into the atmosphere in car engine exhaust fumes.
Which environmental problem is not made worse by this occurance?
Photochemical smog
The hole in the ozone layer
Corrosion of buildings
Acidification of lakes
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11 mark
Which statement about ammonia is completely correct?
Ammonia acts as a nucleophile by accepting a pair of electrons when it reacts with bromoethane.
Ammonia can form a co-ordinate bond with a hydrogen ion to form an ammonium ion.
Ammonia is a base and accepts hydroxide ions.
The shape of the ammonia molecule is pyramidal with bond angles of 109.5°
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21 mark
“Photochemical smog is produced when 1 acts on 2 and 3 .”
Which row correctly identifies 1, 2 and 3?
|
1 |
2 |
3 |
|
|
A B C D |
Heat Sunlight Sunlight Heat |
Nitrogen Nitrogen oxides Nitrogen oxides Hydrocarbons |
Oxygen Sulfur oxides Hydrocarbons Oxygen |
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31 mark
Lime, CaO, is used to reduce the acidity of soil, and ammonium nitrate is a nitrogenous fertiliser.
Why can they not be used in a mixed form?
Ca(NO3)2 is produced, which hardens water.
The dry mixture is explosive.
If damp, ammonia is given off.
If damp, nitric acid will form.
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41 mark
Nitrogen dioxide NO2, sulfur dioxide SO2, and carbon monoxide CO are all atmospheric pollutants.
Which of the following reactions takes place in the atmosphere?
NO2 is reduced to NO by CO
NO2 is reduced to NO by SO2
SO2 is oxidised to SO3 by CO2
CO is spontaneously oxidised to CO2
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11 mark
In a car exhaust, multiple reactions take place as molecules are mixed with oxygen at high temperatures.
Which of the following reactions has the highest enthalpy change?
S + O2
SO2CH4 + 2O2
CO2 + 2H2ON2 + O2
2NO2NO + O2
2NO2
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21 mark
Which reaction using ammonia does not involve the nitrogen atom’s non-bonding pair of electrons?
2NH3 (aq) + Ag+ (aq)
[Ag(NH3)2]+ (aq)2NH3 (l) + 2Na (s)
2NaNH2 (s) + H2 (g)NH3 (g) + HCl (g)
NH4Cl (s)NH3 (g) + CH3I (g)
CH3NH3+I– (s)
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31 mark
Car exhausts release pollutant gases including oxides of nitrogen.
In cities, when a car travels one kilometre, it releases 0.23 g of an oxide of nitrogen NxOy, which occupies 120 cm3.
What are the values of x and y?
(Assume 1 mol of gas molecules occupies 24.0 dm3.)
y = 1, x = 1
y = 1, x = 2
y = 2, x = 1
y = 4, x = 2
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41 mark
Ammonium sulfate in the soil is slowly oxidised by air, producing sulfuric acid, nitric acid and water as the only products.
How many moles of oxygen gas are needed for the complete oxidation of one mole of ammonium sulfate?
1
2
3
4
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51 mark
Aqueous ammonia is added to aqueous sulphur dioxide until just alkaline.
Which salt is produced in this reaction?
NH4SO3
(NH4)2SO3
NH4SO4
(NH4)2SO4
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61 mark
The gases nitrogen dioxide (NO2) and sulfur trioxide (SO3) are required during the formation of acid rain.
In a simulation experiment, the pressure of sulfur trioxide gas was 2 atm in a reaction chamber of 600 cm3 and kept at a constant temperature of 25 °C. 0.75 moles of nitrogen dioxide is added to the reaction chamber as well as water vapour.
How many moles of nitrogen dioxide will be in the reaction chamber after all the sulfur trioxide has reacted to make acid rain?
0
0.25
0.5
0.75
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