Download and practise with this ZIMSEC O-Level Chemistry Paper 1 November 2022 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC O-Level Chemistry question paper for Paper 1 from November 2022. Use it for exam practice under timed conditions. The paper code is 4024/1. Time allowed: 1 hour.
# ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
General Certificate of Education Ordinary Level
**CHEMISTRY**
4024/1
**PAPER 1 Multiple Choice**
**NOVEMBER 2022 SESSION**
1 hour
Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Electronic calculator
TIME 1 hour
### INSTRUCTIONS TO CANDIDATES
Do not open this booklet until you are told to do so.
Write your name, centre number and candidate number on the answer sheet in the spaces provided unless this has already been done for you.
There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet.
Read very carefully the instructions on the answer sheet.
### INFORMATION FOR CANDIDATES
Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this booklet.
A copy of the Periodic Table is printed on page 15.
This question paper consists of 15 printed pages and 1 blank page.
Copyright: Zimbabwe School Examinations Council, N2022.
## Question 1
Which gas has the smallest rate of diffusion?
A methane
B ammonia
C carbon dioxide
D hydrogen chloride
## Question 2
Drops of bromine liquid were placed at the bottom of a glass jar as shown in the diagram. After several hours the vapour spread to fill both jars uniformly as shown in the second diagram.
Which action will speed up the process?
A increasing the temperature
B lowering the temperature
C using a heavier isotope of bromine
D using solid bromine
## Question 3
Purity of a substance can be tested by
A crystallisation.
B chromatography.
C filtration.
D precipitation.
## Question 4
What happens to the oxidation number of nickel when nickel ore, NiS, is changed to pure nickel?
A increases to +1
B decreases to zero
C decreases to +2
D increases to zero
## Question 5
What is the volume occupied by three moles of carbon dioxide at r.t.p?
A \(24 dm^3\)
B \(28 dm^3\)
C \(72 dm^3\)
D \(84 dm^3\)
## Question 6
The chemical formula \(2 NH_3\) represents
A six molecules of hydrogen.
B two molecules of ammonia.
C two molecules of nitrogen.
D two atoms of ammonia.
## Question 7
Ammonia gas reacts with dilute hydrochloric acid as shown in the equation:
\[
NH_{3(g)} + HCl_{(aq)} \longrightarrow NH_4Cl_{(aq)}
\]
What mass of ammonium chloride is formed if 8.5 g of ammonia gas is used?
A \(2.70 g\)
B \(4.25 g\)
C \(8.50 g\)
D \(26.75 g\)
## Question 8
Lathering of soap is a test for the
A purity of water.
B acidity of water.
C hardness of water.
D alkalinity of water.
## Question 9
Which is not a reason for electroplating metals?
A decorating
B protecting
C improving purity
D improving electrical conductivity
## Question 10
Which method of waste disposal is a source of carcinogens?
A bio-digestion
B incineration
C recycling
D landfilling
## Question 11
The correct order of preparing some salts from a metal and an acid is
A crystallisation → evaporation → displacement → filtration.
B displacement → filtration → evaporation → crystallisation.
C evaporation → crystallisation → filtration → displacement.
D filtration → evaporation → displacement → crystallisation.
## Question 12
The pH values of four solutions, W, X, Y and Z, are shown in the table.
| solution | pH |
| :---: | :---: |
| W | 3 |
| X | 5 |
| Y | 7 |
| Z | 11 |
Which solution can be used to neutralize an acidic soil?
A W
B X
C Y
D Z
## Question 13
What is observed when aqueous lead (II) nitrate reacts with sodium iodide?
A a cream precipitate
B a white precipitate
C a yellow precipitate
D a brown precipitate
## Question 14
The diagram shows the positions of four elements in the periodic table represented by the letters W, X, Y and Z.
Which element, W, X, Y or Z forms an acidic oxide?
A W
B X
C Y
D Z
## Question 15
Which element is least reactive?
A Fe
B Mg
C Na
D Zn
## Question 16
The main function of limestone in the blast furnace is to
A oxidise iron ore.
B reduce iron ore.
C remove impurities.
D remove excess carbon.
## Question 17
Which gas can be removed from the exhaust gases by a catalytic convertor?
A carbon dioxide
B carbon monoxide
C hydrocarbons
D sulphur trioxide
## Question 18
Which statement is true about the use of plants in traditional medicine?
A there are clear prescriptions and dosages
B they can improve the health of a person
C they are not poisonous
D they do not cause any allergies
## Question 19
One of the products of heating methane in excess oxygen is
A carbon
B soot
C carbon monoxide
D carbon dioxide
## Question 20
Which structure represents an isomer of butane?
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## Question 21
A hydrocarbon, X, can crack as shown
What could be X?
A \(C_6 H_{14}\)
B \(C_8 …