Johor Trial 2025 Chemistry Kertas 1

Chemistry

Johor Trial 2025 Chemistry Kertas 1

• Johor Trial
• 40 questions
• With explanations

1

Smoking is strictly prohibited in laboratories. Why is smoking not allowed in science laboratories?

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A May cause chemical contamination B Produces excess carbon dioxide C Can cause a fire of flammable materials D Disturbing other students' focus while an experiment is being conducted

T4 Chapter 1.3 Usage, Management and Handling of Apparatus and Materials

2

Based on Diagram 2, which scientist proposed that atoms are small spherical bodies, which cannot be created, destroyed or further divided?

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A John Dalton B J.J. Thomson C James Chadwick D Ernest Rutherford

T4 Chapter 2.2 The Development of the Atomic Model

3

What is the main reason carbon-12 atom was chosen as the standard for determining relative atomic mass?

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A Has 6 electrons in the outermost shell B The lightest element in the Periodic Table of Elements C Form organic compounds in all substances D Exists as solid at room temperature and can be handled easily

T4 Chapter 3.1 Relative Atomic Mass and Relative Molecular Mass

4

Which of the following are characteristics of Group 18 elements? I Chemically inert II Colourless and odourless gas III Has two valence electrons IV Exists as solid at room temperature

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A I and II B I and IV C II and III D III and IV

T4 Chapter 4.3 Elements in Group 18

5

Diagram 5 shows an illustration of conversation between atom P and atom Q. What is the type of chemical bond that will be formed between atom P and atom Q?

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A Ionic B Metallic C Dative D Covalent

T4 Chapter 5.5 Dative Bond

6

Table 6 shows the pH values of solutions P, Q, R and S. | Solution | P | Q | R | S | |---|---|---|---|---| | pH | 5 | 6 | 7 | 9 | Which solution is alkaline?

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A P B Q C R D S

T4 Chapter 6.2 pH Value

7

Diagram 7 shows the apparatus set-up for an experiment to determine the rate of reaction between calcium carbonate and hydrochloric acid. Which of the following units is suitable for measuring the rate of reaction in this experiment?

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A g s⁻¹ B cm³ s⁻¹ C mol s⁻¹ D mol dm⁻³

T4 Chapter 7.1 Determining Rate of Reaction

8

What is the main component in bronze?

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A Iron B Aluminium C Tin D Copper

T4 Chapter 8.1 Alloy and Its Importance

9

Iron(II) nitrate can act as a reducing agent. What changes occur when iron(II) nitrate reacts with bromine water?

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A Iron(II) ion, Fe²⁺ turns into bromide ion, Br⁻ B Iron(II) ion, Fe²⁺ accepts electrons to become iron(III) ion, Fe³⁺ C Iron(III) ion, Fe³⁺ accepts electrons to become iron(II) ion, Fe²⁺ D Iron(II) ion, Fe²⁺ loses electrons to become iron(III) ion, Fe³⁺

T5 Chapter 1.1 Oxidation and Reduction

10

Diagram 10 shows a fruit that contains compound R which has a fruity smell. What is the functional group of compound R?

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A Carboxylate B Carboxyl C Hydroxyl D Single bond between carbon atoms

T5 Chapter 2.2 Homologous Series

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