Melaka Trial 2026 Chemistry Kertas 1

Chemistry

Melaka Trial 2026 Chemistry Kertas 1

• Melaka Trial
• 40 questions
• With explanations

1

Which of the following is the main function of cosmetics?

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A To treat all skin diseases B To cleanse and beautify oneself C To replace the function of medicine D To provide energy to the body

T5 Chapter 5.4 Medicines and Cosmetics

2

Diagram 1 shows the standard representation of the atoms X element and Y element. > ²³₁₁X ²⁴₁₂Y Which of the following statements is **true** regarding these particles?

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A Atom X and atom Y are isotopes B Atom Y has the same number of neutrons as atom X C Ion X⁺ has the same number of electrons as atom Y D Ion Y²⁺ has the same number of electrons as atom X

T4 Chapter 2.3 Atomic Structure

3

Diagram 2 shows a light bulb containing gas X. Which of the following is the property of gas X that enables it to be used in the bulb?

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A Has a very low boiling point. B Provides an inert atmosphere. C Reacts with the tungsten filament at high temperatures. D Exists as a diatomic molecule at room temperature.

T4 Chapter 4.3 Elements in Group 18

4

Diagram 3 shows the standard representation of 3 atom of elements. > ²³₁₁P ¹⁶₈Q ¹⁴₇S Which of the following is the formula of the compound formed?

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A P₂Q B P₂S C QS D SQ

T4 Chapter 2.3 Atomic Structure T4 Chapter 3.3 Chemical Formula

5

What is the process that converts unsaturated fat into saturated fat?

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A Esterification B Hydrolysis C Hydrogenation D Oxidation

T5 Chapter 5.1 Oils and Fats

6

Hydrated copper(II) nitrate crystals have the formula Cu(NO₃)₂.3H₂O with a relative formula mass of 242. What is the relative atomic mass of copper? [Relative atomic mass: N = 14, O = 16, H = 1]

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A 56 B 64 C 65 D 70

T4 Chapter 3.1 Relative Atomic Mass and Relative Molecular Mass

7

What is the effect of alloying pure gold?

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A Become harder B Easier to be shaped C Easier to melt D Become more reactive

T4 Chapter 8.1 Alloy and Its Importance

8

Table 1 shows the pH values of lemon juice. | Substance | pH value | |---|---| | Lemon juice | 2.0 | Which of the following statements is true when lemon juice is diluted?

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A The pH value of lemon juice will increases B The pH value of lemon juice will decreases C The concentration of hydrogen ions, H⁺ increases D The concentration of hydroxide ions, OH⁻ increases

T4 Chapter 6.2 pH Value

9

The statement below describes acid X. > "Acid X is the third member of homologous series of the carboxylic acid." Which of the following is the molecular formula for acid X?

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A C₂H₅COOH B C₃H₇COOH C C₃H₈O D C₂H₄O₂

T5 Chapter 2.2 Homologous Series

10

Diagram 4 shows a pair of spectacles made from special lenses. The lenses of these glasses are made of a type of glass that turns dark when exposed to sunlight. What is chemical causes the phenomenon?

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A CuCl B PbO C AgCl D SiO₂

T4 Chapter 8.4 Composite Materials and Its Importance

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