Oxygen is a chemical element with the symbol O and atomic number 8. It is a colorless, odorless, and tasteless gas that constitutes about 21% of Earth’s atmosphere and is essential for most forms of life, as it plays a critical role in cellular respiration and combustion processes. Discovered independently by Joseph Priestley and Carl Wilhelm Scheele in the 1770s, oxygen was later isolated and studied by Antoine Lavoisier, who recognized its importance in oxidation reactions. This element is the third most abundant in the universe and is vital for various industrial applications, including steel production, water treatment, and medical therapies like oxygen therapy for respiratory conditions. Its compounds, such as water (H₂O) and carbon dioxide (CO₂), are fundamental to biological and environmental systems.
Table of contents
- Part 1: Create an amazing Oxygen quiz using AI instantly in OnlineExamMaker
- Part 2: 20 Oxygen quiz questions & answers
- Part 3: OnlineExamMaker AI Question Generator: Generate questions for any topic
Part 1: Create an amazing Oxygen quiz using AI instantly in OnlineExamMaker
The quickest way to assess the Oxygen knowledge of candidates is using an AI assessment platform like OnlineExamMaker. With OnlineExamMaker AI Question Generator, you are able to input content—like text, documents, or topics—and then automatically generate questions in various formats (multiple-choice, true/false, short answer). Its AI Exam Grader can automatically grade the exam and generate insightful reports after your candidate submit the assessment.
Overview of its key assessment-related features:
● Create up to 10 question types, including multiple-choice, true/false, fill-in-the-blank, matching, short answer, and essay questions.
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Part 2: 20 Oxygen quiz questions & answers
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1. What is the atomic number of oxygen?
A. 6
B. 8
C. 10
D. 16
Answer: B
Explanation: The atomic number of oxygen is 8, which represents the number of protons in its nucleus.
2. Who is credited with the discovery of oxygen?
A. Isaac Newton
B. Joseph Priestley
C. Antoine Lavoisier
D. Both B and C
Answer: D
Explanation: Joseph Priestley isolated oxygen in 1774, and Antoine Lavoisier confirmed its properties, so both are credited.
3. What is the most abundant isotope of oxygen?
A. Oxygen-16
B. Oxygen-17
C. Oxygen-18
D. Oxygen-15
Answer: A
Explanation: Oxygen-16 is the most abundant isotope, making up about 99.76% of naturally occurring oxygen.
4. In what state is oxygen at room temperature?
A. Solid
B. Liquid
C. Gas
D. Plasma
Answer: C
Explanation: Oxygen exists as a gas at room temperature, with a boiling point of -183°C and a melting point of -218°C.
5. What is the primary role of oxygen in combustion reactions?
A. It acts as a catalyst
B. It provides the fuel
C. It acts as an oxidizing agent
D. It produces heat
Answer: C
Explanation: Oxygen supports combustion by acting as an oxidizing agent, combining with other substances to produce oxides.
6. What percentage of the Earth’s atmosphere is oxygen?
A. 21%
B. 78%
C. 1%
D. 50%
Answer: A
Explanation: Oxygen makes up approximately 21% of the Earth’s atmosphere by volume.
7. What is the chemical formula for oxygen gas?
A. O
B. O2
C. O3
D. H2O
Answer: B
Explanation: Oxygen gas exists as a diatomic molecule, represented as O2.
8. What process in plants produces oxygen?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Fermentation
Answer: B
Explanation: Photosynthesis in plants uses sunlight to convert carbon dioxide and water into glucose and oxygen.
9. What are the allotropes of oxygen?
A. O and O2
B. O2 and O3
C. H2O and CO2
D. O and H2O
Answer: B
Explanation: The allotropes of oxygen are O2 (dioxygen) and O3 (ozone).
10. How does oxygen support human life?
A. By providing energy for muscles
B. By aiding in cellular respiration
C. By regulating body temperature
D. By digesting food
Answer: B
Explanation: Oxygen is essential for cellular respiration, where it helps convert food into energy in the mitochondria.
11. What is the boiling point of oxygen in Celsius?
A. -100°C
B. -183°C
C. 0°C
D. 100°C
Answer: B
Explanation: Oxygen boils at -183°C, which is why it is a gas at room temperature.
12. What type of bond is found in an O2 molecule?
A. Ionic bond
B. Covalent bond
C. Metallic bond
D. Hydrogen bond
Answer: B
Explanation: O2 molecules are held together by a double covalent bond between the two oxygen atoms.
13. What happens when oxygen reacts with iron?
A. It forms rust
B. It produces water
C. It creates carbon dioxide
D. It generates heat without reaction
Answer: A
Explanation: Oxygen reacts with iron in the presence of water to form iron oxide, commonly known as rust.
14. What is ozone (O3) primarily known for?
A. Being a fuel source
B. Protecting Earth from UV radiation
C. Causing global warming
D. Providing oxygen for breathing
Answer: B
Explanation: Ozone in the stratosphere absorbs harmful ultraviolet radiation from the sun.
15. How is oxygen primarily obtained for industrial use?
A. From water electrolysis
B. Fractional distillation of air
C. Burning fossil fuels
D. Photosynthesis in factories
Answer: B
Explanation: Oxygen is industrially produced by cooling and fractionally distilling liquid air.
16. What is the electron configuration of an oxygen atom?
A. 1s2 2s2 2p4
B. 1s2 2s2 2p6
C. 1s2 2s2 2p2
D. 1s2 2s1 2p5
Answer: A
Explanation: Oxygen has 8 electrons, with the configuration 1s2 2s2 2p4.
17. What is the effect of oxygen deficiency in the body?
A. Hypoxia
B. Hyperthermia
C. Dehydration
D. Hypertension
Answer: A
Explanation: Oxygen deficiency leads to hypoxia, which can cause tissue damage and impair bodily functions.
18. In what form is oxygen stored for medical use?
A. As a liquid in tanks
B. As a solid in capsules
C. As a gas in cylinders
D. Both A and C
Answer: D
Explanation: Oxygen for medical use is stored as a compressed gas in cylinders or as a liquid in specialized tanks.
19. What is the difference between oxygen and ozone?
A. Ozone has three oxygen atoms
B. Oxygen is stable, ozone is not
C. Both A and B
D. They are the same
Answer: C
Explanation: Ozone (O3) has three oxygen atoms and is less stable than oxygen (O2), making it more reactive.
20. What role does oxygen play in the water molecule?
A. It forms hydrogen bonds
B. It is the central atom in H2O
C. It makes water acidic
D. Both A and B
Answer: D
Explanation: In H2O, oxygen is the central atom and enables hydrogen bonding, which gives water its unique properties.
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