ZIMSEC O-Level Chemistry Paper 1 November 2019 Question Paper

About this question paper

This is the ZIMSEC O-Level Chemistry question paper for Paper 1 from November 2019. Use it for exam practice under timed conditions, then check your work against the marking scheme. The paper code is 4024/1. Time allowed: 1 hour. See the marking scheme.

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Extracted text

# ZIMBABWE SCHOOL EXAMINATIONS COUNCIL <br> General Certificate of Education Ordinary Level

**CHEMISTRY**

**PAPER 1 Multiple Choice**

NOVEMBER 2019 SESSION

Additional materials:
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Electronic calculator

4024/1

1 hour

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 14.

**This question paper consists of 14 printed pages and 2 blank pages.**

Copyright: Zimbabwe School Examinations Council, N2019.

## Question 1
Which gas has the smallest rate of diffusion?

A methane

B ammonia

C carbon dioxide

D hydrogen chloride

## Question 2
Which diagram correctly represents a sulphide ion, \(S^{2-}\)?

![](https://ocr.unopasa.com/p/ocr_assets/c2af9cf85f488f1a3d6c05256f7186191fa9a452672f3216d0b1ea39738729e4.jpg)

B

![](https://ocr.unopasa.com/p/ocr_assets/a9bdab81946c63ed2e205007dc23f286ddf979325de7d499ddeacb343890145f.jpg)

C

![](https://ocr.unopasa.com/p/ocr_assets/a7a11d85b1ed2e3cd425679fd1894c2391eb0b7459265e7bace26f5c90905067.jpg)

D

![](https://ocr.unopasa.com/p/ocr_assets/677dab44417c6c32aab89b81152f510da7916fb1ee017d27c8d895061a1df589.jpg)

## Question 3
Which apparatus is used to measure an exact volume of \(25.00 cm^3\)?

A a \(50.00 cm^3\) burette

B a \(25.00 cm^3\) pipette

C a \(25.00 cm^3\) conical flask

D a \(25.00 cm^3\) measuring cylinder

## Question 4
What is uv

A \(24 dm^3\)

B \(28 dm^3\)

C \(72 dm^3\)

D \(84 dm^3\)

## Question 5
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 6
An exothermic reaction is one which has

A more gaseous reactants than products.

B more gaseous products than reactants.

C a greater bond formation energy than bond breaking energy.

D a greater bond breaking energy than bond formation energy.

## Question 7
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 8
Which gas decreases in concentration during eutrophication in a pond?

A hydrogen

B methane

C nitrogen

D oxygen

## Question 9
Which method of waste disposal is a source of carcinogens?

A bio-digestion

B incineration

C recycling

D landfilling

## Question 10
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 11
Which chemical is a pollutant from gold processing?

A Hg

B \(Al_2(SO_4)_3\)

C HCl

D Pb

## Question 12
The stages shown below occur in the contact process.

At which stage is the formation of an acid spray prevented?

A \(S + O_2 \longrightarrow SO_2\)

B \(2 SO_2 + O_2 \rightleftharpoons 2 SO_3\)

C \(SO_3 + H_2 SO_4 \longrightarrow 2 H_2 S_2 O_7\)

D \(H_2 S_2 O_7 + H_2 O \longrightarrow 2 H_2 SO_4\)

## Question 13
Which one is a chemical property of a metal?

A forms positive ions

B forms negative ions

C forms acidic oxides

D forms coloured solutions

## Question 14
Which element is least reactive?

A Fe

B Mg

C Na

D Zn

## Question 15
Which metal is added to steel to give it anti-corrosion properties?

A chromium

B copper

C zinc

D gold

## Question 16
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 17
The correct order of preparing some salts from a metal and an acid is

A crystallisation \(\longrightarrow\) evaporation \(\longrightarrow\) displacement \(\longrightarrow\) filtration.

B displacement \(\longrightarrow\) filtration \(\longrightarrow\) evaporation \(\longrightarrow\) crystallisation.

C evaporation \(\longrightarrow\) crystallisation \(\longrightarrow\) filtration \(\longrightarrow\) displacement.

D filtration \(\longrightarrow\) evaporation \(\longrightarrow\) displacement \(\longrightarrow\) crystallisation.

## Question 18
Which substance is reduced in the reaction shown?

$$
CaO + C \rightarrow Ca + CO_2
$$

A CaO

B C

C Ca

D \(CO_2\)

## Question 19
Which is not a reason for electroplating metals?

A decorating

B protecting

C improving purity

D improving electrical conductivity

## Question 20
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 21
Ammonia gas reacts with dilute hydrochloric acid as shown in the equation:

$$
NH_{3(g)} + HCl_{(aq)} \longrightarrow NH_4 Cl_{(aq)}
$$

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 22
An organic compound has \(92.3\%\) carbon and \(7.7\%\) hydrogen by mass.

The empirical formula of the compound is

A \(C_3 H_5\).

B \(C_2 H_3\).

C \(CH_2\).

D CH.

## Question 23
A hydrocarbon has an empirical formula of \(CH_2\) and a relative molecular mass of 28.

What is the percentage composition of carbon in the hydrocarbon?

A \(14\%\)

B \(21\%\)

C \(50\%\)

D \(86\%\)

## Question 24
A breathalyser is an instrument used to measure the amount of alcohol in a breath. The device contains …