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Home/ECAT/ECAT Chemistry Gases 1 Online Test Preparation

ECAT Chemistry Gases 1 Online Test Preparation

Maan AliLast Updated: April 26, 2025

ECAT Chemistry Gases Test 1

ECAT Chemistry Gases Chaper Online Test

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:	ECAT Entry Test Chemistry Online Test Interview Questions about Chemistry All Universities Entrance Test Recruitments Tests

ECAT Chemistry Gases 1 MCQS Online Test

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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49. 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

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

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Maan AliLast Updated: April 26, 2025

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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!

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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

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