Gases MCQS According to PMDC Syllabus | Gases Chapter MCQs

1. What is the relative rate of effusion of CO and CO2?

A. CO is 1.25 times faster than CO2
B. CO is 3.75 times faster than CO2
C. CO is 1.25 times faster than CO
D. Both diffuse at the same rate

Answer: Option A

2. Which of these gases diffuse more quickly than oxygen?
A. H2S
B. NO
C. Cl2
D. N2O

Answer: Option B

3. Which of the following is not considered as an intermolecular force between molecules?
A. Coordinate covalent bonds
B. Hydrogen bonds
C. Debye forces
D. London dispersion forces

Answer: Option A

4. The weakest (in strength) of the following intermolecular forces is
A. Hydrogen bonding
B. Vander Waals force
C. Forces among the polar molecules
D. Ionic bond

Answer: Option B

5. Ideal gasses have all the following characteristics except.
A. The absence of intermolecular forces
B. Collisions among the molecules of an ideal gas are perfectly elastic
C. The molecules occupy no space
D. All of the above are correct

Answer: Option C

6. Which of the following statements is true about plasma
A. It may be the first state of matter
B. It is not a phase transition
C. It is a conductor of electricity
D. All of the above

Answer: Option D

7. Which statement is correct
A. PVmT
B. PCT
C. PMdT
D. All above

Answer: Option D

8. Under what conditions the gases deviate from the ideal behaviour?
A. High-temperature
B. Low temperature
C. High-pressure
D. B and C

Answer: Option D

9. Which one has the lowest density at room temperature?
A. Ne
B. N2
C. NH3
D. CO

Answer: Option C

10. The introduction of the Kelvin scale in thermometry is according to
A. Boyles law
B. Charles law
C. Daltons law
D. Grahams law

Answer: Option B

11. 0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same
A. Value of a
B. Mass
C. Atoms
D. Both B and C

Answer: Option D

12. At constant temperature the pressure of an ideal gas is doubled its density becomes
A. Half
B. Double
C. Same
D. None

Answer: Option B

13. The diffusion of gases at absolute zero will be
A. Unchanged
B. Slightly decreased
C. Slightly increased
D. Zero

Answer: Option D

14. Which of the following option is incorrect about gases?
A. All molecules move with the same speed
B. All molecules behave independently
C. PV / RT = n
D. All gases cannot be liquefied through Linds Method

Answer: Option A

15. The critical temperature for different gases is different and depends upon
A. Size of molecule
B. Shape of molecule
C. Intermolecular attractions
D. All of the above

Answer: Option D

16. In how many forms do matter exists?
A. Three
B. Four
C. Five
D. Two

Answer: Option B

17. What is the simplest form of matter?
A. Gas
B. Liquid
C. Solid
D. Semi-solid

Answer: Option A

18. What is the abundant form of matter on earth?
A. Gas
B. Liquid
C. Solid
D. Plasma

Answer: Option C

19. Which state of matter has the lowest density?
A. Gas
B. Liquid
C. Solid
D. Plasma

Answer: Option A

20. What do we call to the sudden expansion of plasma?
A. Avogadro’s law
B. Grahams law of diffusion
C. Joule Thompson effect
D. Daltons law of partial pressure

Answer: Option C