Name: ……………………………………………………….Class: ……… Stream:………..
545/1
CHEMISTRY
PAPER 1
1 ½ HOURS
UGANDA CERTIFICATE OF EDUCATION
END OF YEAR EXAMINATIONS
S. 3 CHEMISTRY
PAPER 1
TIME: 1HOUR 30MINUTES
Instructions
This paper consists of 50 objective type questions. Answer all questions.
MARK SHEET
1
11
21
31
41
2
12
22
32
42
3
13
23
33
43
4
14
24
34
44
5
15
25
35
45
6
16
26
36
46
7
17
27
37
47
8
18
28
38
48
9
19
29
39
49
10
20
30
40
50
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1. Which one of the following gases is obtained by fractional distillation.
A) oxygen
B) ammonia
C) Sulphur dioxide
D) hydrogen
2. The formula of rust;
A) FeO(OH)
C) Fe2O3.nH2O
B) FeO.nH2O
D) Fe2O3(OH)
3. A compound reacts with concentrated sulpuric acid to give a colourless
gas which fumes with ammonia. The compound contains a
A) chloride
B) carbonate
C) nitrate
D) sulphate
4. Which one of the following substances will react with magnesium to give
hydrogen;
A) dilute hydrochloric acid
B) aqueous ammonia
C) potassium hydroxide
D) ethanol
5. Which one of the following atomic numbers will indicate the least reactive
element?
A) 2:8:1
B) 2:8:2
C) 2:8:7
D) 2;8:8
6. 20cm3 of 0.2M HCl reacts with 25cm3 of sodium hydroxide solution. The
morality of the hydroxide is;
25 x0.2
20 x0.2
A)
B)
20 x0.2
25 x0.2
25
20
C)
D)
20 x0.2
25 x0.2
7. Potassium aluminium sulphate (Potash alum) is used during the purification
of water.
A) removing colouring matter
B) removing suspended matter
C) killing harmful bacteria
D) making water soft
8. The percentage composition of nitrogen in ammonium nitrate, NH 4NO3 is
(N = 14, H=1, O=16)
14
28
x100
x100
A)
B)
80
80
C)
52
x100
80
D)
76
x100
80
9. Which of the substances below conducts electricity in the solid state?
A) graphite
B) iodine
C) sulphur
D) phosphorous
2
10. Which of the following is not an acidic oxide?
A) carbon dioxide
B) sulphur dioxide
C) carbonmonoxide
D) phosphorous (V) oxide
11. Which of the following nitrates will decompose when heated to form a
nitrate
A) sodium nitrate
B) calcium nitrate
C) zinc nitrate
D) silver nitrate
12. Which one of the following processes is not used to remove hardness in
water?
A) treatment with sodium carbonate
B) addition of calcium hydroxide
C) distillation of water
D) addition of sodium stearate
13. When an electric current is passed through molten magnesium chloride
the;
A) chloride ions will travel to the anode
B) magnesium ions will gain electrons from the current
C) magnesium chloride will glow brightly
D) magnesium chloride conduct the current and sublime
14. 6.5g of an element M, combines with excess oxygen to give 8.1g of the
oxide. The simplest formula of the oxide is (M=65, O=16)
A) M2O
B) MO
C) MO2
D) M2O3
15. A white solid formed when lime water is left exposed to air for sometime is
A) calcium carbonate
B) calcium oxide
C) calcium hydroxide
D) calcium chloride
16. When silver nitrate was added to a solution followed by dilute nitric acid,
a white precipitate was formed. The solution contained;
A) sulphate ions
B) chloride ions
C) carbonate ions
D) sulphite ions
17. When a solid was heated it changed to a gas without passing through the
liquid state. This change of state is called;
A) vaporization
B) sublimation
C) distillation
D) condensation
18. Ionic compounds have high melting points because;
A) ions strongly attract each other
B) ions strongly repel each other
C) they combine by transfer of electrons
D) ions are arranged in a crystal lattice
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19. Which one of the following methods is suitable for preparing anhydrous
ion(III) chloride in the laboratory.
A) pass dry chlorine over heated iron
B) pass dry hydrogen chloride over heated ion
C) react ion with dilute hydrochloric acid
D) react iron(III) oxide with dilute hydrochloric acid
20. A solution of hydrogen chloride in dry methyl benzene will
A) form sodium chloride acid water with sodium hydroxide
B) liberate carbondioxide with sodium hydrogen carbonate
C) liberate hydrogen with magnesium
D) not conduct electricity
21. Which one of the following mixtures can be separated by filtration/
A) sugar and water
B) ink and water
C) sulphur and iron
D) sand and kerosene
22. The atomic number of element Y is 19. The formula of its chloride is;
A) YCl2
B) YCl
C) Y 2Cl
D) Y 2Cl2
23. The atomic number of an element is
A) the number of electrons and protons
B) the number of protons and neutrons
C) the number of neutrons
D) the number of protons
24. Ammonium chloride, NH 4Cl was dissolved in water. The resultant solution.
A) had no effect on litmus paper
B) changed red litmus paper blue
C) changed blue litmus paper red
D) bleached litmus paper
25. Which one of the following compounds doe not give off carbon dioxide
when strongly heated;
A) sodium carbonate
B) calcium carbonate
C) calcium hydrogen carbonate
D) sodium hydrogen carbonate
26.The ion formed by the element X of atomic number 13 is
A) X3+
B) X2C) X2+
D) X327. Sodium hydrogen carbonate and sodium carbonate occur in solution in
Lake Magadi. The two salts are separated by a method known as
A) fractional distillation
B) fractional crystallization
C) evaporation
D) chromatography
4
28. The percentage of oxygen in baking powder, NaHCO3 is
(Na=23, H=1, C=12, O=16)
48x100
16x100
A)
B)
84
84
C)
16x100
102
D)
48x100
102
29. Which one of the following is an electronic configuration of an atom of an
inert gas?
A) 2:8:8
B) 2:8:7
C) 2:8:6
D) 2:8:8:1
30. Copper (II) carbonate when heated in air decomposes according to the
equation.
CuCO3(s)
CuO(s) + CO2(g)
What volume of carbon dioxide is produced at STP when 0.5moles of copper(II)
oxide is formed. (Cu=64, O=16, 1mole of a gas at STP occupies 22.4l)
A) 112.0l
B) 44.0l
C) 22.4l
D) 11.2l
31. Which one of the following substances has a giant atomic structure?
A) sulphur
B) diamond
C) iodine
D) phosphorous
32. Which one of the following compounds is used as a catalyst in the
manufacture of sulphur tnoxide from air and sulphur dioxide
A) alumina
B) vanadium (V) oxide
C) magnese (IV) oxide
D) iron powder
33. When a dilute solution of sodium chloride is electrolysed using carbon
electrodes , the substance formed at the anode is
A) chlorine
B) oxygen
C) sodium
D) hydrogen
34. Which one of the following metals will displace lead from its salt in solution
A) aluminium
B) silver
C) calcium
D) zinc
35. The number of protons in the nucleus of an atom of 115B is
A) 5
B) 6
C) 11
D) 16
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36. Which one of the following process decreases the concentration of carbon
dioxide in the atmosphere;
A) rusting
B) respiration
C) combustion
D) photosynthesis
37. One of the product of the electrolysis of brine is
A) sodium nitrate
B) sodium carbonate
C) sodium sulphate
D) sodium hydroxide
38. A 0.2molar solution of X contains 18.25g of X per litre of the solution. The
relative molecular mass of X is;
A) 18.25
B) 36.50
C) 45.63
D) 91.25
39. Which of the following substances will sublime when heated?
A) ammonium chloride
B) sodium chloride
C) water
D) potassium chloride
40. The following are factors that affect the process of electrolysis except
A) concentrations of the ions in solution
B) position of the ion in the lectrochemical series
C) change of the ions at each electrode
D) nature of electrodes used
Each of the questions 41 to 45 consists of an assertion (statement) on the left
hand side and a reason on the right side. Select
A) if both the assertion and the reason are true statements and the reason is a
correct explanation of the assertion
B) if both the assertion and the reason are true statements but the reason is not
a correct explanation of the assertion
C) if the assertion is true but the reason is not a correct statement.
D) if the assertion is not correct but the reason is a correct statement.
INSTRUCTIONS SUMMARIZED
Assertion
Reason
A)
True
True( reason is a correct explanation)
B)
True
True (reason is not a correct explanation)
C)
True
Incorrect
D)
Incorrect
True
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41. Oxygen molecule is diatomic
because
it has a high melting point
42. Ammonia gas turns moist red
Litmus
because
it is a volatile gas
43. Chlorine is used in the
Purification of water
because
chlorine is a bleaching agent
44. 2M nitric acid is a strong an acid because
as 2M ethanoic acid
the acids have the same
molarity
45. Sulphuric acid changes sugar
From white t black
sulphuric acid is an oxidizing
agent
because
In each of the questions 46 to 50, one or more of the answers given may be
correct. Read each question carefully and then indicate the correct answer
according to the following.
A) If 1, 2 and 3 only are correct
B) If 1 and 3 only are correct
C) If 2 and 4 only are correct
D) If 4 only is correct.
46. Carbon is similar to sulphur in the both
1. are non metallic solids
2. exist in allotropic forms
3. form covalent compounds
4. form neutral oxides
47. Which of the following observations take(s) place when copper(II) sulphate is
electrolysed using graphite electrodes?
1. are non metallic solids
2. exist in allotropic forms
3. form covalent compounds
4. form neutral oxides
48. When zinc metal is placed in a solution of copper9II) sulphate
1. a brown solid is formed
2. a colourless gas is evolved
3. the solution fades in colour
4. no observable reaction is made
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49. Iron is prevented from rusting by
1. greasing
2. electroplating
3. galvanizing
4. neutralizing
50. Ammonia gas may be dried using
1. concentrated sulphuric acid
2. calcium hydroxide
3. calcium chloride
4. calcium oxide
*** END ***
Good Luck
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