ZIMSEC O-Level Chemistry Paper 1 June 2024 Question Paper

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

**CHEMISTRY**

**PAPER 1 Multiple Choice**

**JUNE 2024 SESSION**

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

INSTRUCTIONS TO CANDIDATES

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 correct answer and record your choice on the separate answer sheet.

INFORMATION FOR CANDIDATES

A copy of the Periodic Table is printed on page 19.

**This question paper consists of 19 printed pages and 1 blank page.**

Question 1

The diagram shows part of a burette.

What reading is shown on the diagram?

A \(16.25 \mathrm{~cm}^{3}\)

B \(16.20 \mathrm{~cm}^{3}\)

C \(16.29 \mathrm{~cm}^{3}\)

D \(17.75 \mathrm{~cm}^{3}\)

Question 2

An ion of an element \(\mathbf{X}\) is represented as follows.

Which statement about \(\mathbf{X}\) is true?

A Y is the nucleon number.

B \(\quad \mathrm{Z}\) is the atomic number.

C W is the proton number.

D W is the charge on the ion.

Question 3

The diagram shows the structure of a neutral atom of an element.

How many protons does the atom have?

A 6

B 7

C 13

D 12

Question 4

The diagram shows the atomic structure of a neutral atom of an element \(z\).

To which group of the periodic table does element \(\boldsymbol{z}\) belong ?

A 2

B 5

C 7

D 3

Question 5

Which row correctly describes the states of the substances at room temperature and pressure?

Question 6

Which property shows that calcium is not a transition element?

A Its compounds are soluble in water.

B Its compounds are coloured in solution.

C Its compounds are white when solid.

D It has a very high density.

Question 7

The diagram shows a fractional distillation plant for distilling crude oil.

Which fraction has compounds with the highest boiling point range?

A petroleum gas

B kerosene

C bitumen

D lubricating oil

Question 8

The diagram shows a simple cell.

Which combination of metals would allow electrons to flow in the direction shown?

| | X | Y | | :--- | :--- | :---: | | A | copper | lead | | B | iron | zinc | | C | lead | iron | | D | zinc | iron |

Question 9

The diagram shows results obtained when aqueous sodium hydroxide was added to solution X and heated.

Which ion was present in solution X ?

A \(\mathrm{NO}_{3}\)

B \(\mathrm{SO}_{4}{ }^{2-}\)

C \(\mathrm{NH}_{4}{ }^{+}\)

D \(\mathrm{Pb}^{2+}\)

Question 10

The equation shows the dissolution of ammonium chloride.

\(\mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}+(\mathrm{aq}) \longrightarrow \mathrm{NH}_{4(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}\)

Which diagram \(\mathbf{A}, \mathbf{B}, \mathbf{C}\) or \(\mathbf{D}\) shows the energy profile for the dissolution?

C. energy

D. energy

Question 11

Which pair of ions causes hardness in water ?

A \(\mathrm{Ca}^{2+}\) and \(\mathrm{Zn}^{2+}\)

B \(\mathrm{Ca}^{2+}\) and \(\mathrm{Mg}^{2+}\)

C \(\mathrm{Mg}^{2+}\) and \(\mathrm{Na}{ }^{+}\)

D \(\mathrm{Mg}^{2+}\) and \(\mathrm{Zn}^{2+}\)

Question 12

Which statement is true about the electrolysis of dilute sulphuric acid ?

A amount of sulphuric acid remains unchanged

B sulphate ions are discharged at the anode

C hydroxide ions are discharged at the cathode

D hydroxide ions remain in the electrolyte

Question 13

Which option gives the correct catalyst for the given process ?

| | process | catalyst | | :--- | :--- | :--- | | A | hydrogenation | platinum | | B | ostwald | vanadium (v) oxide | | C | contact | nickel | | D | haber | iron |

Question 14

Which is not a use of carbon dioxide gas ?

A refridgerant

B extinguishing fire

C as a preservative in fizzy drinks

D as a fuel in welding

Question 15

Which property of lime makes it useful in agriculture?

A has high melting point

B is slightly soluble in water

C is basic in nature

D conducts electricity in molten state

Question 16

Which one is not a product of destructive distillation of coal ?

A coke

B coal gas

C ammonia liquor

D carbon dioxide

Question 17

The table shows some physical properties of elements \(\mathrm{W}, \mathrm{X}, \mathrm{Y}\) and Z .

Which element \(\mathrm{W}, \mathrm{X}, \mathrm{Y}\) or Z is metallic ?

A Z

B Y

C X

D W

Question 18

Which reaction is a redox reaction?

A \(\mathrm{CuCO}_{3(s)} \rightarrow \mathrm{CuO}_{(s)}+\mathrm{CO}_{2(g)}\)

B \(\mathrm{HCl}_{\text {(aq) }}+\mathrm{NaOH}_{\text {(aq) }} \rightarrow \mathrm{NaCl}_{\text {(aq) }}+\mathrm{H}_{2} \mathrm{O}_{\text {(l) }}\)

C \(\mathrm{AgNO}_{3(a q)}+\mathrm{NaCl}_{(a q)} \rightarrow \mathrm{AgCl}_{(s)}+\mathrm{NaNO}_{3(a q)}\)

D \(\mathrm{Fe}_{2} \mathrm{O}_{3(s)}+3 \mathrm{CO}_{(g)} \rightarrow 2 \mathrm{Fe}_{(l)}+3 \mathrm{CO}_{2(g)}\)

Question 19

Which are the correct products of the reaction between magnesium and steam ?

A \(M g H_{2(S)}+O_{2(g)}\)

B \(M g(O H)_{2_{(a q)}}+O_{2_{(g)}}\)

C \(M g(O H)_{2_{(a q)}}+H_{2(g)}\)

D \(M g O_{(s)}+H_{2(g)}\)

Question 20

Which catalyst is used in the reaction of ethene with steam to produce ethanol ?

A sulphuric acid

B phosphoric (v) acid

C ethanoic acid

D aluminium oxide

Question 21

An ester has the chemical formula:

\(\mathrm{CH}_{3} \mathrm{COOCH}_{2} \mathrm{CH}_{3}\)

Which compounds react to produce the ester?

A \(\mathrm{CH}_{3} \mathrm{COOH}\) and \(\mathrm{CH}_{3} \mathrm{OH}\)

B \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) and \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)

C \(\mathrm{CH}_{3} \mathrm{COOH}\) and \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)

D \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) and \(\mathrm{CH}_{3} \mathrm{OH}\)

Question 22

Which graph shows the correct trend in melting points of Group (VII) elements?

melting point \({ }^{\circ} \mathrm{C}\)

Question 23

A volume of \(25 \mathrm{~cm}^{3}\) of 0.20 moldm \({ }^{-3}\) hydrochloric acid was neutralised by \(50 \mathrm{~cm}^{3}\) of 0.10 moldm \({ }^{-3}\) sodium hydroxide. The temperature increased by \(14^{\circ} \mathrm{C}\). The energy change for the reaction was 4410 J .

The enthalpy change of neutralisation was

A \(\quad 882.000 \mathrm{kJmol}^{-1}\).

B \(196.000 \mathrm{kJmol}^{-1}\).

C \(\quad 14.700 \mathrm{kJmol}\).

D \(4.410 \mathrm{kJmol}^{-1}\).

Question 24

Ethanol is produced by fermentation of glucose at a temperature of \(37^{\circ} \mathrm{C}\) in the presence of yeast because yeast

A cells produce too much carbon dioxide at lower temperatures.

B cells produce too much ethanol at lower temperatures.

C enzymes are denatured at higher temperatures.

D enzymes are denatured at lower temperatures.