States of Matter Quiz Online Practice Test

1. In a sealed container containing equal moles of H₂(g) and O₂(g), when one-fourth of the hydrogen gas escapes through a pin-hole, what fraction of the oxygen gas escapes simultaneously?

1/16

1/4

1/2

1/8

2. Under what conditions would a gas such as carbon monoxide follow the ideal gas laws?

Low temperature and low pressure

Low temperature and high pressure

High temperature and low pressure

High temperature and high pressure

3. If the temperature of a gaseous molecule is doubled, by what factor does its average velocity increase?

1.4

2.8

4. Calculate the molecular mass of a gas that requires three times more time to effuse than helium under identical conditions of volume.

9 u

64 u

27 u

36 u

5. At identical temperatures, how does the average molar kinetic energy of N2 compare to that of CO?

KE₁ > KE₂

KE₁ < KE₂

KE₁ = KE₂

insufficient information given

6. Determine the temperature where N₂ effuses at 1.625 times the rate of SO₂ at 500 degrees Celsius.

620 degrees Celsius

173 degrees Celsius

110 degrees Celsius

373 degrees Celsius

7. Determine the change in the root mean square speed of a gas when the temperature increases from 27°C to 927°C.

Increases by a factor of √3

Doubles

Halves

Remains the same

8. If 1.204 x 10²¹ molecules of H₂SO₄ are removed from 392 mg of H₂SO₄, find the moles of H₂SO₄ left.

4 x 10^-3

1.5 x 10^-3

1.2 x 10^-3

2 x 10^-3

9. What fraction of the total pressure is exerted by hydrogen when mixed with ethane in an empty container at 25°C?

15/16

1/16

1/2

10. Which law states that at constant temperature, the product of a gas's pressure and volume remains constant?

Gay-Lussac's law

Charles' law

Boyle's law

None of these

11. Under which conditions do non-ideal gases behave more like ideal gases?

high temperature and high pressure

high temperature and low pressure

low temperature and high pressure

low temperature and low pressure

12. Under constant temperature conditions, if 380 mL of dry oxygen is collected at 730 mm Hg pressure, what will its volume be at 760 mm Hg?

365 mL

449 mL

569 mL

621 mL

13. Which of the following represents the lowest layer of Earth's atmosphere?

Stratosphere

Troposphere

Ionosphere

Mesosphere

14. Which of the following accurately describes the behaviour of gases?

Gases are highly incompressible

Gases exert uniform pressure in all directions

Gases have a fixed volume and shape

Gases possess the highest density among the three states of matter

15. Which of the following elements is not in a gaseous state at room temperature?

Hydrogen

Oxygen

Mercury

Nitrogen

16. Gases have lower density than solids and liquids because of ______.

No thermal energy

Higher intermolecular energy

Both intermolecular energy and thermal energy are the same

Higher thermal energy

17. Which of the following principles is not associated with gas behaviour?

Boyle’s law

Charles’ law

Hooke’s law

Gay-Lussac’s law

18. What is the approximate concentration of nitrogen in Earth's atmosphere?

78.09%

21%

20%

32%

19. How would you describe the movement of particles in gases?

Only vibratory

Very slow

Both vibratory and irregular

Extremely rapid and random

20. What is the amount of moles in 64 grams of oxygen gas (O₂)?

3 moles

2 moles

1 mole

16 moles

Test Name:	States of Matter Quiz
Subject Category:	Chemistry
Test Type:	Multiple Choice Questions
Total Score / Questions:	20 / 20
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.

States of Matter MCQ Quiz Online Practice Test