GCE O-Level Chemistry Paper 1 past question 2019

Louis Nkengakah

3 years ago

Cameroon GCE O-Level Chemistry Paper 1 past question 2019. Past question paper GCE June 2019 Chemistry paper 1; Download Chemistry GCE past question papers and answers.

It should be noted that this past question paper is for Ordinary level Students of the General secondary education system. That said, students from Uganda for example can as well take advantage of these questions to further hone their skills.

You can learn more about the Cameroon GCE Board here.

GCE O-Level Chemistry Paper 1 past question 2019 Instructions and data

Instructions to candidates

Mobile phones are NOT allowed in the examination room.
MULTIPLE CHOICE QUESTION PAPER

Duration: One and a half hours

Read the following instructions carefully before you start answering the questions in this paper. Make sure you have a soft HB pencil and an eraser for this examination.

USE A SOFT HB PENCIL THROUGHOUT THE EXAMINATION.
DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.

Before the examination begins:

Check that this question booklet is headed ‘‘Ordinary Level -0515 Chemistry 1”
Fill in the information required in the spaces above.
Fill in the information required in the spaces provided on the answer sheet using your HB pencil:
- Candidate Name, Exam Session, Subject Code, Centre Number and Candidate Number.
- Take care that you do not crease or fold the answer sheet or make any marks on it other than those asked for in these instructions.

How to answer the questions in this examination

Answer ALL the 50 questions in this Examination.
Calculators are allowed
Each question has FOUR suggested answers: A, B, C and D. Decide which answer is appropriate. Find the number of the question on the Answer Sheet and draw a horizontal line across the letter to join the square brackets for the answer you have chosen. For example, if C is your correct answer, mark C as shown below:

[A] [B] ~~[C]~~ [D]

Mark only one answer for each question. If you mark more than one answer, you will score a zero for that question. If you change your mind about an answer, erase the first mark carefully, then mark your
Avoid spending too much time on any one question. If you find a question difficult, move on to the next question. You can come back to this question later.
Do all rough work in this booklet using the blank spaces in the question booklet.
At the end of the examination, the invigilator shall collect the answer sheet first and then the question booklet. DO NOT ATTEMPT TO LEAVE THE EXAMINATION HALL WITH IT.

Useful data

Relative Atomic Masses
Hydrogen (H) = 1.0
Carbon (C) = 12.0Copper (Cu) = 64.0
Oxygen (O) = 16.0 zinc (Zn) = 65.0
Chlorine (Cl) = 35.5
Nitrogen (N) = 14.0
Sodium (Na) = 23.0
I Faraday = 96000 coulombs.
Molar volume of any gas at r.t.p = 24000cm³
Avogadro number = 6.02×10²³
Specific heat capacity of water= 4.2 Jg^-10C^-1

50 MCQ Questions

Choose a metal commonly used as overhead electric cables.
A: Zinc
B: Aluminium
C: Iron
D: Copper
Select a method that can be used to separate a mixture of water and petrol.
A: Evaporation to dryness
B: Separating funnel
C: Sublimation
D: Simple distillation
Determine the atomic number of an atom with electronic configuration 2,8,8,2.
A: 10
B: 4
C: 2
D: 20
The thermal decomposition of calcium nitrate will produce;
A: Ca(N0₂)₂ and O₂
B: C₅H₁₀
C: C₅H₁₁
D: C₅H₈
The transition metal used as a catalyst in the manufacture of ammonia is
A: Vanadium
B: Copper
C: Iron
D: Platinum
The element X exists naturally as two isotopes, ⁸⁰X and ⁸²X in the ratio 1 :1 . The relative atomic mass of X will be
A: 81
B: 80.5
C: 82
D: 80 Questions 7-9 concern the following table. M, N, O, P and Q are not the usual symbols of the elements. Each element can be selected once, more than once or Not at all.
Select from the table:

Element M N O P Q

Proton 12 16 17 18 20

Electron 12 17 17 18 20
An element that will not react easily with other elements.
A: M
B: N
C: O
D: P
Elements that belong to the same group of the Period Table
A: M and N
B: M and Q
C: O and Q
D: N and O
Determine the formula of the compound formed between M and N
A: M₂N₂
B: MN
C: MN₂
D: M₂N
Give the formula of the fifth member of the homologous series with general formula C_nH_2n+2
A: C₅H₁₂
B: C₅H₁₀
C: C₅H₁₁
D: C₅H₈
Name two air pollutants which are responsible for acid rain.
A: N₂ and S0₂
B: NO₂ and C0₂
C: C0₂ and SCT
D: S0₂ and N0₂
Which of the following substances will burn with a smoky and luminous flame?
A: Propane
B: Ethene
C: Hydrogen
D: Butane
Calculate the amount of substance in moles in250cnv³ of 0.IM HCI_(aq).
A: 0.05
B: 0.25
C: 0.025
D: 0.5
When excess carbon dioxide is passed through lime water, the milky colour disappears due to the formation of
A: Ca(HC0₃)₂
B: CaCO₃
C: CaO
D: Ca(OH)₂
What is the colour imparted to a Bunsen flame by a copper (II) salt?
A: Bluish green
B: Apple green
C: Golden yellow
D: Brick red

16. The apparatus used in preparing a standard solution is a
A: Burette
B: Measuring cylinder
C: Pipette
D: Volumetric flask

17. During an oxidation reaction, an oxidizing agent
A: Gains oxygen
B: Loses oxygen
C: Loses hydrogen
D: Loses electrons

18. Calculate the quantity of electricity in coulombs if a current of 0.5A is passed through an electrolyte for 15 minutes.
A: 450
B: 45
C: 7.5
D: 27000

19. The number of replaceable hydrogen atoms in a molecule of an acid is called its
A: Acidity
B: Alkalinity
C: Basicity
D: pH value

20. The substance left in the glass tube when excess dry hydrogen is passed over heated copper (II) oxide is:
A: Copper(I)oxide
B: Water
C: Oxygen
D: Metallic copper

21. The function of limestone in the extraction iron is to remove
A: Excess air
B: Earthy impurities
C: Unburnt coke
D: Molten iron

Questions 22 and 23

Instructions: Each question is followed by four responses numbered 1 -4. One or more of these responses is (are) correct. Decide which response(s) (are) correct then choose
A: If only 1 , 2 and 3 are correct
B: If only I and 3 are correct
C: If on ly 2 and 4 are correct
D: If only 4 is correct

22. The factors that influence the preferential discharge of ions during electrolysis are
1. Position of ion on the electrochemical series.
2. Nature of the electrode.
3. Concentration of the ion.
4. the charge on the ion.

23. A catalyst is a substance which
1. Increases the temperature of a reaction
2. Increases the rate of a chemical reaction
3. Increases the yield of a chemical reaction
4. Remains chemically unchanged at the end of a reaction

24. The components of crude oil can be separated by
A: Reforming
B: Cracking
C: Simple distillation
D: Fractional distillation

25. The empirical formula of an organic compound is CH. If the relative molecular mass of the compound is 78, then the molecular formula is:
A: C₂H₂
B: C₆H₆
C: C₄H₄
D: C₆H₁₂

26. Carbon dioxide is prepared in the laboratory by the action of dilute hydrochloric acid on marble chips. Dilute sulphuric acid is not suitable for this process because;
A: An insoluble coat of calcium sulphate will be formed causing the reaction to stop.
B: The reaction will be too fast.
C: The reaction will be too slow.
D: Marble chips do not react with dilute sulphuric acid.

27. Select a carbonate that will NOT decompose when strongly heated in an open crucible.
A: CaC0₃
B: C₁₁CO₃
C: Na₂C0₃
D: MgC0₃

Questions 28-30 concern the following substances
A: Ammonia gas
B: Lemon juice
C: Water
D: Ethanol
Each letter can be used once, more than once or not at all. Select from A to D a substance

28. Which produces steamy fumes with PCI_5.

29. That will turn moist red litmus paper blue.

30. That will turn blue litmus paper red.

31. Determine the percentage by mass of nitrogen in NH₄N0₃.(RMM of NH₄N0₃ = 80)
A: 17.5
B: 70
C: 35
D: 22.5

32. Which of these halogens is the most reactive?
A: Chlorine
B: Bromine
C: Iodine
D: Fluorine

33. Which of the following occurs during the electrolysis of aqueous copper (II) sulphate using copper electrodes?
A: The cathode increases in size
B: The anode increase in size
C: The colour of the solution fades
D: Oxygen is discharged at the anode

34. The compound most likely to be present in a bag of fertilizer is:
A: Ca(N0₃)₂
B: (NH₄)₃P0₄
C: NH₄CI
D: NaCI

Questions 35 – 37

Instructions: Each question consists of a statement in the left-hand column followed by another in the right-hand column. Decide whether each of the statements is true or false. Then on your answer sheet, choose

A: If both statements are TRUE and the second statement is the CORRECT EXPLANATION of the first
B: If both statements are TRUE but the second statement is NOT the correct explanation of the first,
C: If the first statement is true but the second statement is FALSE
D: If the first statement is FALSE but the second statement is TRUE.

	FIRST STATEMENT	SECOND STATEMENT
35	Elements of Group VII show similar chemical properties	Group VII elements have same number of shells
36	The presence of Cl^–,Br^– and I ions in solution can be tested using AgN0₃solution	All three ions form coloured precipitates with AgN0₃ solution
37	Copper will displace magnesium from a solution of a magnesium salt	Copper is below magnesium in the electrochemical series

38. Palm wine goes sour when exposed to air for some days because;
A: Glucose is converted to gluconic acid
B: Ethanol is converted to Ethanoic acid
C: Glucose is converted to ethanol
D: Palm wine is converted to palmitic acid

39. Calculate the mass of zinc that will produce 16g of copper according to the equation: Zn_(s) + CuSO_4(aq) → ZnSO_4(aq) + Cu_(s)
A: 1.625
B: 15.75
C: 16.25
D: 1.58

40. Which of the following is a basic oxide?
A: AI₂O₃
B: S0₂
C: Na₂0
D: CO

41. What is the mass of 0.1 mole of Na₂CO₃? (Rmm of Na₂CO₃= 106)
A: 106g
B: 10.Og
C: 1.06g
D: 10.6g

42. Plastics pollute the environment because they are;
A: Kerosene and water
B: Ethanol and water
C: NH4CI and NaCl
D: NaCl and H20

43. The different components of universal indicator solution can best be separated by
A: Fractional distillation
B: Filtration
C: Chromatography
D: Simple distillation

44. Consider the equation NaOH_(aq) + HCI_{(aq) →} NaCl_(aq) + H₂O_(l) ΔH = X KJ
What does X represent?
A: Heat of neutralization
B: Activation energy
C: Heat of formation
D: Heat of solution

45. 0.1MHC1 reacts with powdered Na₂CO₃ according to the equation

2HCl_(aq) + Na₂CO_3(s) 2NaCl_(s) → 2NaCl_(aq) + H₂0_(l) + C0_2(g). How can the reaction be made to go faster?
A: Using 0.5MHC1
B: Using lumps ofNa2COj
C: Adding water to the reaction mixture
D: Using 0.01MHCI