Personality Test
Interviews
IQ Test
Pak Current Affairs

Menu

Home
Classes
- Punjab
- Federal
- Sindh
Entry Test
- ECAT Test
- MDCAT Test
Forces
GK
Aptitude Test
Subject Wise

Home/Chemistry Mcqs/Chemistry Gases Test 1 Online Mcqs

Chemistry Gases Test 1 Online Mcqs

Maan AliLast Updated: October 15, 2025

Important Chemistry Gases Test 1 Question and Answer

Total Questions:	15
Time Allowed:	15 Minutes
Total Marks:	15
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Gases Test 1 Practice Test Online With Explanation

Please wait...

0%

Page 1 of 2
Uncategorized

1. Which gas law can be used to calculate the amount of gas formed or consumed in a reaction?
Charles’s Law
Ideal Gas Law
Boyle’s Law
Avogadro’s Law

Loading...

2. What is the standard temperature in Kelvin?
373 K
100 K
0 K
273 K

Loading...

3. What happens to gas volume if pressure is halved at constant temperature?
It becomes zero
It doubles
It remains unchanged
It halves

Loading...

4. The volume of a gas increases with increase in temperature due to:
Increase in molecular collisions
Increase in particle mass
Decrease in molecular motion
Condensation

Loading...

5. Which of the following is a derived unit for volume?
Cubic centimeter
All of the above
Liter
Cubic meter

Loading...

6. What is the value of 'R' in SI units?
1.0 J/mol·K
8.314 J/mol·K
0.0821 L·atm/mol·K
273 J/mol·K

Loading...

7. Which of the following is an assumption of the ideal gas law?
Collisions between particles are perfectly elastic
Gas particles exert attractive forces
Gases cannot expand infinitely
Gas molecules occupy significant volume

Loading...

8. When temperature is held constant, what happens to the product of pressure and volume?
Equals zero
Remains constant
Increases
Decreases

Loading...

9. Which of the following statements is TRUE about real gases?
Real gases have no intermolecular forces
Real gases do not occupy any volume
Real gases deviate from ideal behavior at high pressure and low temperature
Real gases always obey PV = nRT

Loading...

10. What is the significance of absolute zero?
Molecular motion ceases completely
Gases become solid
Gas volume becomes infinite
Gas pressure becomes infinite

Loading...

11. Which of the following gases behaves most like an ideal gas?
H₂O
NH₃
H₂
CO₂

Loading...

12. Which of the following expresses Boyle’s Law mathematically?
V ∝ n
V ∝ T
PV = constant
P ∝ T

Loading...

13. Which law helps derive the Ideal Gas Equation from multiple gas laws?
All of the above
Boyle’s Law
Charles’s Law
Avogadro’s Law

Loading...

14. What does the van der Waals equation correct for?
Intermolecular forces and molecular volume
Ideal gas behavior
Volume of container
Number of moles

Loading...

15. The ideal gas law does NOT hold true under which condition?
High temperature
Low pressure
High pressure
Low volume

Loading...

16. A gas occupies 10 L at 1 atm. What will its volume be at 2 atm (assuming temperature is constant)?
5 L
15 L
20 L
10 L

Loading...

17. In which unit is gas volume usually measured?
Atmosphere
Pascal
Kelvin
Liter

Loading...

18. Which of the following gases deviates most from ideal behavior?
Helium
Ammonia
Oxygen
Hydrogen

Loading...

19. What are the values of STP in chemistry?
300 K and 1 atm
273°C and 1 atm
0°C and 2 atm
273 K and 1 atm

Loading...

20. How do you define molar volume?
Volume of liquid per mole
Volume of 1 mole of gas at STP
Volume of 1 mole of solid
Volume of water per gram

Loading...

21. Why are real gases not ideal at low temperatures?
Their kinetic energy increases
Intermolecular forces become significant
They turn into solids
They expand more

Loading...

22. The kinetic energy of a gas is directly proportional to its:
Pressure
Volume
Temperature
Mass

Loading...

23. Ideal gases obey the ideal gas equation under:
Vacuum conditions
Low temperature and high pressure
All conditions
High temperature and low pressure

Loading...

24. What is the value of absolute zero in Celsius?
-100°C
-273°C
273°C
0°C

Loading...

25. Which law describes the relationship between number of moles and volume?
Gay-Lussac’s Law
Avogadro’s Law
Charles’s Law
Boyle’s Law

Loading...

Page 2 of 2

26. Which of the following is NOT a postulate of Kinetic Molecular Theory?
Gas particles are in constant random motion
Gas particles have negligible volume
Gas particles attract each other strongly
Collisions between particles are elastic

Loading...

27. The Ideal Gas Equation is:
P + V = nRT
PV = TnR
PV = nRT
P/V = nRT

Loading...

28. The SI unit of pressure is:
mmHg
atm
pascal
torr

Loading...

29. What is the unit of the universal gas constant R when pressure is in Pa and volume in m³?
mol·L·K
J/mol·K
mol·m³·K
atm·L/mol·K

Loading...

30. According to kinetic theory, the motion of gas particles is:
Random and constant
Oscillatory and slow
Circular and uniform
Linear and static

Loading...

31. Which law relates the volume and temperature of a gas?
Charles’s Law
Dalton’s Law
Boyle’s Law
Graham’s Law

Loading...

32. According to Avogadro’s Law, equal volumes of all gases at the same temperature and pressure contain:
Equal masses
Equal number of molecules
Equal boiling points
Equal density

Loading...

33. Which of the following gas laws is based on the inverse relationship between pressure and volume?
Avogadro’s Law
Gay-Lussac’s Law
Charles’s Law
Boyle’s Law

Loading...

34. Which of the following has the highest diffusion rate?
N₂
O₂
CO₂
H₂

Loading...

35. What is the volume occupied by 1 mole of an ideal gas at STP?
273 L
22.4 L
1 L
1 m³

Loading...

36. At constant pressure, doubling the temperature (in Kelvin) will:
Reduce the pressure
Halve the volume
Double the volume
Not affect the volume

Loading...

37. Which condition is least favorable for ideal gas behavior?
Room temperature and moderate pressure
High pressure and low temperature
Low pressure and high temperature
Low pressure and low temperature

Loading...

38. What is the pressure of 1 mole of ideal gas at STP?
760 atm
2 atm
0.5 atm
1 atm

Loading...

39. Which of the following equations is derived from combining basic gas laws?
V = nT
P + V = nT
V/n = PRT
PV = nRT

Loading...

40. Which factor causes real gases to deviate from ideal behavior?
Weak intermolecular forces
High temperature
Negligible volume of gas particles
Strong intermolecular forces

Loading...

41. Which of the following values is closest to atmospheric pressure?
760 mmHg
10 atm
500 torr
1 Pa

Loading...

42. Why do gases have low density?
Constant volume
High boiling point
Strong attraction between particles
Large intermolecular spaces

Loading...

43. Which gas will deviate least from ideal behavior?
NH₃
CH₄
CO₂
SO₂

Loading...

44. What happens to gas pressure if temperature increases at constant volume?
Remains constant
Increases
Becomes zero
Decreases

Loading...

45. Which of the following explains Charles’s Law correctly?
Volume of a gas is directly proportional to pressure
Volume of a gas is constant irrespective of temperature
Volume of a gas is inversely proportional to temperature
Volume of a gas is directly proportional to temperature at constant pressure

Loading...

46. Which gas constant (R) value is used when pressure is in atm and volume in liters?
8.314 J/mol·K
1.0 L·atm/mol·K
22.4 L/mol
0.0821 L·atm/mol·K

Loading...

47. Which variable must be converted to Kelvin in gas law calculations?
Temperature
Volume
Mass
Pressure

Loading...

48. At constant volume, the pressure of a gas is directly proportional to:
Volume
Number of moles
Temperature
Density

Loading...

49. According to Boyle’s Law, when pressure increases, volume:
Decreases
Remains constant
Becomes zero
Increases

Loading...

50. Which variable remains constant in Charles’s Law?
Moles
Pressure
Temperature
Volume

Loading...

Loading...

<<
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
>>

You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.

Related Posts

Basic Concepts of Chemistry Online Mcqs Test
Chemistry Industrial Chemistry Online Mcqs Test
Chemistry Aldehydes and Ketones Online Mcqs Test
Chemistry Alcohols And Phenols Online Mcqs Test
Chemistry Alkyl Halides Online Mcqs Test
Chemistry Macro Molecules Online Mcqs Test
Chemistry Carboxylic Acid Online Mcqs Test
Chemistry of Hydrocarbons Online Mcqs Test
Chemistry Transition Elements Online Mcqs Test
Chemistry Reaction Kinetics Online Mcqs Test

Maan AliLast Updated: October 15, 2025

Maan Ali

Hey there! I'm Maan Ali, your online test prep pal. Join me in the adventure of acing exams with ease. I'll share tricks, practice tests, and all you need to rock your studies. Let's make learning fun and success a sure thing!

Website

Show one comment

One Comment

Ahmed Bux says:

August 25, 2016 at 2:56 pm

this website gives alot of wrong answers so friends never do preparation from this site, you better visit pakprep

Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Comment *

Name *

Email *

Δ

© Copyright 2025, All Rights Reserved | Gotest

Back to top button

Close

Search for: