2019 O-Level Pure Chemistry MCQ Paper 1 Answers (Subject Code

Check out the suggested answers for the recent 2019 O Level Pure Chemistry (subject code: 6092) Paper 1 MCQ by Singapore’s highly recommended O Level Chemistry and IP Chemistry tutor Mr Sean Chua who has been conducting O Level Chemistry and IP Chemistry Tuition Classes since 1999.

Answer Key to 2019 O Level Pure Chemistry Paper 1 MCQ:

1.	A (Topic: Experimental Techniques)
2.	B (Topic: Qualitative Analysis QA)
3.	C (Topic: Purification & Separation Techniques)
4.	D (Topic: Qualitative Analysis QA)
5.	D (Topic: Atomic Structure)
6.	D (Topic: Chemical Bonding & Structural Properties)
7.	C (Topic: Chemical Bonding & Structural Properties)
8.	B (Topic: Macromolecules)
9.	A (Topic: Chemical Bonding & Structural Properties)
10.	C (Topic: Mole Concept & Chemical Calculations)
11.	D (Topic: Mole Concept & Chemical Calculations)
12.	C (Topic: Mole Concept & Chemical Calculations)
13.	B (Topic: Electrolysis)
14.	C (Topic: Electrolysis)
15.	A (Topic: Energy Changes)
16.	D (Topic: Energy Changes)
17.	D (Topic: Speed of Reaction)
18.	B (Topic: Speed of Reaction)
19.	B (Topic: Redox Reaction)
20.	A (Topic: Acids, Bases & Preparation of Salts)
21.	C (Topic: Periodic Table & Group Trends)
22.	A (Topic: Acids, Bases & Preparation of Salts)
23.	C (Topic: Air & The Atmosphere)
24.	C (Topic: Periodic Table & Group Trends)
25.	A (Topic: Periodic Table & Group Trends)
26.	B (Topic: Periodic Table & Group Trends)
27.	B (Topic: Periodic Table & Group Trends)
28.	A (Topic: Metals & Reactivity Series)
29.	A (Topic: Electrolysis)
30.	A (Topic: Metals & Reactivity Series)
31.	D (Topic: Air & The Atmosphere)
32.	A (Topic: Organic Chemistry)
33.	C (Topic: Organic Chemistry)
34.	A (Topic: Organic Chemistry)
35.	B (Topic: Organic Chemistry)
36.	B (Topic: Macromolecules)
37.	B (Topic: Macromolecules)
38.	C (Topic: Organic Chemistry)
39.	D (Topic: Organic Chemistry)
40.	A (Topic: Macromolecules)

Summary of Topics Tested in Paper 1 Multiple Choice Questions:

• Experimental Techniques (x 1 question)
• Purification & Separation Techniques (x 1 question)
• Atomic Structure (x 1 question)
• Chemical Bonding & Structural Properties (x 3 questions)
• Acids, Bases & Preparation of Salts (x 2 questions)
• Qualitative Analysis QA (x 2 questions)
• Mole Concept & Chemical Calculations (x 3 questions)
• Periodic Table & Group Trends (x 5 questions)
• Metals & Reactivity Series (x 2 questions)
• Speed of Reaction (x 2 questions)
• Energy Changes (x 2 questions)
• Redox Reaction (x 1 question)
• Electrolysis (x 2 questions)
• Air & The Atmosphere (x 2 questions)
• Organic Chemistry (x 6 questions)
• Macromolecules (x 4 questions)

Analysis of O Level Pure Chemistry Paper 1 MCQ:

For 2019 O Level Pure Chemistry Paper 1 MCQ, Cambridge International Examiners are testing O Level Pure Chemistry students heavily on Periodic Table & Groups Trends, Organic Chemistry and Macromolecules. A total of 15 out of 40 questions were being tested based on those topics.

Topics on Kinetic Particle Theory and Ammonia were not tested at all. For the past 10-15 years, we usually have more questions on Acids, Bases & Preparation of Salts but for this year, we have only 2 questions.

In general, this paper is considered quite easy for those students who have strong foundation of their Chemistry Concepts and associated keywords. There weren’t any extremely difficult or tricky questions this year.

Lastly, there were 3 repeat questions based on the O Level Pure Chemistry Ten Year Series (2009-2018). Question 10 came out in 2014, Question 17 came out in 2016 and Question 38 came out in 2011.

Hope you find the suggested answers and the analysis useful towards your learning. Feel free to share it with your friends.

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• O Level Chemistry – Periodic Table Mini Series (Part I)
• O Level Chemistry – Periodic Table Mini Series (Part II)
• Mole Calculations – No. 1 Killer in O Level Chemistry?
• O Level Chemistry Question – Organic Chemistry (Alcohol)
• O Level Chemistry – Periodic Table Mini Series (Part III)