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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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15. 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 always obey PV = nRT
Real gases deviate from ideal behavior at high pressure and low temperature

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Maan AliLast Updated: October 15, 2025

Chemistry Gases Test 1 Online Mcqs

Important Chemistry Gases Test 1 Question and Answer

Chemistry Gases Test 1 Practice Test Online With Explanation

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Maan Ali

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Important Chemistry Gases Test 1 Question and Answer

Chemistry Gases Test 1 Practice Test Online With Explanation

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