Perak Trial 2026 Chemistry Kertas 1 · Set 1

Chemistry

Perak Trial 2026 Chemistry Kertas 1 · Set 1

• Perak Trial Set 1
• 40 questions
• With explanations

1

Diagram 1 shows the standard representation of atom of element X. > ⁷₃X Which of the following is represented by the number 7?

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A Proton number B Nucleon number C Number of neutrons D Number of electrons

T4 Chapter 2.3 Atomic Structure

2

Diagram 2 shows an atomic model. Which of the following scientist discovered this atomic model?

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A Niels Bohr B John Dalton C J.J. Thomson D Ernest Rutherford

T4 Chapter 2.2 The Development of the Atomic Model

3

Potassium ion, K⁺ combines with dichromate(VI) ion, Cr₂O₇²⁻ to form an ionic compound. Which of the following is the chemical formula of the compound formed?

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A KCrO₆ B K₂CrO₆ C KCr₂O₇ D K₂Cr₂O₇

T4 Chapter 3.3 Chemical Formula

4

Chlorine reacts with sodium hydroxide to form sodium chloride, sodium chlorate(I) and water. Which of the following is the chemical formula of sodium chlorate(I)?

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A NaCl B NaOCl C NaOCl₃ D NaHCO₃

T4 Chapter 3.3 Chemical Formula T4 Chapter 4.5 Elements in Group 17

5

Diagram 3 shows the structural formula of a compound. Which of the following catalyst is used to produce the compound?

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A Fe B Ni C Pt D V₂O₅

T4 Chapter 4.7 Transition Elements

6

In the formation of the hydroxonium ion, H₃O⁺, which particle contributes the pair of electrons to form the dative bond?

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A The hydrogen atom from H⁺ ion B The oxygen atom in the water molecule C All hydrogen atoms in the water molecule D Both the H⁺ ion and oxygen atom contribute one electron each

T4 Chapter 5.5 Dative Bond

7

Which of the following statements best explains why solid oxalic acid does not react with magnesium ribbon?

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A Oxalic acid is a weak acid B Hydrogen ions are not present in the absence of water C The magnesium ribbon is covered with an oxide layer D The temperature is too low to start the reaction

T4 Chapter 6.1 The Role of Water in Showing Acidic and Alkaline Properties

8

Which unit is commonly used to express the rate of reaction for a process that produces gas?

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

T4 Chapter 7.1 Determining Rate of Reaction

9

Which substance is added to glass to give it a high refractive index?

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A Boron trioxide B Calcium carbonate C Magnesium oxide D Lead(II) oxide

T4 Chapter 8.2 Composition of Glass and Its Uses

10

An engineer chooses optical fibres over copper wire for a high-speed internet network. What is the main reason for this choice?

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A Optical fibres use higher electric current to increase transmission speed B Optical fibres can transmit data in the form of light with minimal energy loss C Optical fibres have lower electrical resistance than copper D Optical fibres reflect light along the outer surface of the fibre

T4 Chapter 8.4 Composite Materials and Its Importance

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