Chemistry Gases Test 1 Online Mcqs

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Question 1

1. Ideal gases obey the ideal gas equation under:

Answer

Low temperature and high pressure

Answer

Vacuum conditions

Answer

All conditions

Answer

High temperature and low pressure

Question 2

2. The SI unit of pressure is:

Question 3

3. Which gas constant (R) value is used when pressure is in atm and volume in liters?

Answer

0.0821 L·atm/mol·K

Answer

8.314 J/mol·K

Answer

1.0 L·atm/mol·K

Answer

22.4 L/mol

Question 4

4. What does the van der Waals equation correct for?

Answer

Intermolecular forces and molecular volume

Answer

Number of moles

Answer

Volume of container

Answer

Ideal gas behavior

Question 5

5. Which of the following is a derived unit for volume?

Answer

Cubic meter

Answer

All of the above

Answer

Cubic centimeter

Question 6

6. At constant pressure, doubling the temperature (in Kelvin) will:

Answer

Reduce the pressure

Answer

Double the volume

Answer

Not affect the volume

Answer

Halve the volume

Question 7

7. The volume of a gas increases with increase in temperature due to:

Answer

Decrease in molecular motion

Answer

Increase in molecular collisions

Answer

Condensation

Answer

Increase in particle mass

Question 8

8. What happens to gas pressure if temperature increases at constant volume?

Answer

Becomes zero

Answer

Remains constant

Question 9

9. Which of the following is an assumption of the ideal gas law?

Answer

Gases cannot expand infinitely

Answer

Gas particles exert attractive forces

Answer

Gas molecules occupy significant volume

Answer

Collisions between particles are perfectly elastic

Question 10

10. Why are real gases not ideal at low temperatures?

Answer

Their kinetic energy increases

Answer

They expand more

Answer

Intermolecular forces become significant

Answer

They turn into solids

Question 11

11. Which of the following has the highest diffusion rate?

Question 12

12. Which condition is least favorable for ideal gas behavior?

Answer

Room temperature and moderate pressure

Answer

Low pressure and low temperature

Answer

High pressure and low temperature

Answer

Low pressure and high temperature

Question 13

13. What is the standard temperature in Kelvin?

Question 14

14. Which variable must be converted to Kelvin in gas law calculations?

Answer

Temperature

Question 15

15. Which variable remains constant in Charles’s Law?

Answer

Temperature

Question 16

16. Which of the following is NOT a postulate of Kinetic Molecular Theory?

Answer

Gas particles attract each other strongly

Answer

Gas particles have negligible volume

Answer

Gas particles are in constant random motion

Answer

Collisions between particles are elastic

Question 17

17. Which of the following equations is derived from combining basic gas laws?

Answer

P + V = nT

Question 18

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

Question 19

19. What is the value of absolute zero in Celsius?

Question 20

20. Which of the following statements is TRUE about real gases?

Answer

Real gases do not occupy any volume

Answer

Real gases have no intermolecular forces

Answer

Real gases always obey PV = nRT

Answer

Real gases deviate from ideal behavior at high pressure and low temperature

Question 21

21. What is the pressure of 1 mole of ideal gas at STP?

Question 22

22. Why do gases have low density?

Answer

High boiling point

Answer

Large intermolecular spaces

Answer

Strong attraction between particles

Answer

Constant volume

Question 23

23. The kinetic energy of a gas is directly proportional to its:

Answer

Temperature

Question 24

24. Which factor causes real gases to deviate from ideal behavior?

Answer

Weak intermolecular forces

Answer

High temperature

Answer

Strong intermolecular forces

Answer

Negligible volume of gas particles

Question 25

25. According to Avogadro’s Law, equal volumes of all gases at the same temperature and pressure contain:

Answer

Equal masses

Answer

Equal density

Answer

Equal number of molecules

Answer

Equal boiling points

Question 26

26. Which law helps derive the Ideal Gas Equation from multiple gas laws?

Answer

Avogadro’s Law

Answer

All of the above

Answer

Boyle’s Law

Answer

Charles’s Law

Question 27

27. What is the unit of the universal gas constant R when pressure is in Pa and volume in m³?

Answer

mol·m³·K

Answer

atm·L/mol·K

Question 28

28. Which of the following values is closest to atmospheric pressure?

Question 29

29. Which of the following expresses Boyle’s Law mathematically?

Answer

PV = constant

Question 30

30. Which of the following gases behaves most like an ideal gas?

Question 31

31. Which of the following gas laws is based on the inverse relationship between pressure and volume?

Answer

Boyle’s Law

Answer

Avogadro’s Law

Answer

Charles’s Law

Answer

Gay-Lussac’s Law

Question 32

32. Which of the following explains Charles’s Law correctly?

Answer

Volume of a gas is inversely proportional to temperature

Answer

Volume of a gas is constant irrespective of temperature

Answer

Volume of a gas is directly proportional to temperature at constant pressure

Answer

Volume of a gas is directly proportional to pressure

Question 33

33. What is the value of 'R' in SI units?

Answer

1.0 J/mol·K

Answer

0.0821 L·atm/mol·K

Answer

8.314 J/mol·K

Answer

273 J/mol·K

Question 34

34. At constant volume, the pressure of a gas is directly proportional to:

Answer

Number of moles

Answer

Temperature

Question 35

35. Which of the following gases deviates most from ideal behavior?

Question 36

36. According to kinetic theory, the motion of gas particles is:

Answer

Oscillatory and slow

Answer

Random and constant

Answer

Circular and uniform

Answer

Linear and static

Question 37

37. Which gas will deviate least from ideal behavior?

Question 38

38. When temperature is held constant, what happens to the product of pressure and volume?

Answer

Remains constant

Answer

Equals zero

Question 39

39. The ideal gas law does NOT hold true under which condition?

Answer

High pressure

Answer

High temperature

Answer

Low volume

Answer

Low pressure

Question 40

40. According to Boyle’s Law, when pressure increases, volume:

Answer

Becomes zero

Answer

Remains constant

Question 41

41. What are the values of STP in chemistry?

Answer

300 K and 1 atm

Answer

273 K and 1 atm

Answer

273°C and 1 atm

Answer

0°C and 2 atm

Question 42

42. What is the significance of absolute zero?

Answer

Gases become solid

Answer

Molecular motion ceases completely

Answer

Gas pressure becomes infinite

Answer

Gas volume becomes infinite

Question 43

43. How do you define molar volume?

Answer

Volume of 1 mole of solid

Answer

Volume of 1 mole of gas at STP

Answer

Volume of liquid per mole

Answer

Volume of water per gram

Question 44

44. What happens to gas volume if pressure is halved at constant temperature?

Answer

It doubles

Answer

It remains unchanged

Answer

It becomes zero

Question 45

45. The Ideal Gas Equation is:

Answer

P + V = nRT

Question 46

46. Which law relates the volume and temperature of a gas?

Answer

Graham’s Law

Answer

Boyle’s Law

Answer

Charles’s Law

Answer

Dalton’s Law

Question 47

47. Which gas law can be used to calculate the amount of gas formed or consumed in a reaction?

Answer

Boyle’s Law

Answer

Charles’s Law

Answer

Avogadro’s Law

Answer

Ideal Gas Law

Question 48

48. Which law describes the relationship between number of moles and volume?

Answer

Gay-Lussac’s Law

Answer

Boyle’s Law

Answer

Avogadro’s Law

Answer

Charles’s Law

Question 49

49. In which unit is gas volume usually measured?

Answer

Atmosphere

Question 50

50. What is the volume occupied by 1 mole of an ideal gas at STP?

Question 51

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Total Questions:	15
Time Allowed:	15 Minutes
Total Marks:	15
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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