Question 1
Which gas makes up approximately 78% by volume of dry air on Earth?
Correct Answer:
Nitrogen
Question 2
Sea water contains dissolved ions. Which ion is present in the highest concentration in sea water?
Correct Answer:
Chloride ion
Question 3
Limestone is a mineral mainly composed of which compound?
Correct Answer:
Calcium carbonate
Question 4
An atom of an element has 17 protons, 18 neutrons and 17 electrons. What is the mass number of this atom?
Correct Answer:
35
Question 5
What is the electronic arrangement of a magnesium atom (atomic number 12)?
Correct Answer:
2,8,2
Question 1
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About this Exam

Prepare with the HKDSE Chemistry Practice Questions - Hong Kong Diploma of Secondary Education (HKDSE) Chemistry Exam practice quiz. This question bank includes 100 questions covering acid, water, reaction, metal, and solution. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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HKDSE Chemistry Practice Questions - Hong Kong Diploma of Secondary Education (HKDSE) Chemistry Exam

This practice set contains 100 questions from the matching question bank and focuses on acid, water, reaction, metal, and solution. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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