A gas occupies 500 cm³ at 760 mm Hg. At constant temperature, what is its volume at 950 mm Hg?
Correct answer C. 400 cm³
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Gases MCQs
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- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
In the van der Waals equation, the term an²/V² corrects for ____
Correct answer B. intermolecular attractive forces
Which gas is expected to behave most nearly like an ideal gas?
Correct answer B. He
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For an ideal gas, the compressibility factor Z = PV/nRT is ____
Correct answer A. equal to 1 at all pressures
Which two assumptions of the kinetic molecular theory fail for real gases at high pressure and low temperature?
Correct answer A. Molecular volume is negligible and there are no intermolecular attractions
In SI units, the gas constant R is expressed as ____
Correct answer C. N m K⁻¹ mol⁻¹
At constant pressure, a gas volume plotted against Celsius temperature gives a straight line. When extended, this line meets the temperature axis at about ____
Correct answer D. −273 °C
According to Charles’s law, at constant pressure the volume of a gas changes per degree Celsius by what fraction of its volume at 0 °C?
Correct answer B. 1/273
Which of the following is NOT a correct value of the general gas constant R?
Correct answer B. 8.314 dm³ atm K⁻¹ mol⁻¹
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How many moles of gas occupy 4.1 dm³ at 2.0 atm and 400 K (R = 0.0821 dm³ atm K⁻¹ mol⁻¹)?
Correct answer B. 0.25 mol
A gas has a density of 1.25 g dm⁻³ at STP. Which of these gases could it be?
Correct answer B. N₂
What pressure is exerted by 0.50 mol of an ideal gas in a 10 dm³ vessel at 27 °C (R = 0.0821 dm³ atm K⁻¹ mol⁻¹)?
Correct answer D. 1.23 atm
Under which conditions do real gases deviate most from ideal behaviour?
Correct answer C. High pressure and low temperature
According to the kinetic molecular theory, collisions between gas molecules are ____
Correct answer D. perfectly elastic
Absolute zero is the temperature at which ____
Correct answer D. the volume of an ideal gas would theoretically become zero
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A gas occupies 300 cm³ at 27 °C. What is its volume at 127 °C if pressure stays constant?
Correct answer C. 400 cm³
A gas occupies 2.0 dm³ at 1.0 atm. At constant temperature it is compressed to 0.50 dm³. What is its new pressure?
Correct answer A. 4.0 atm
A gas exerts a pressure of 380 mm Hg. What is this pressure in kilopascals (1 atm = 760 mm Hg = 101.325 kPa)?
Correct answer B. 50.7 kPa
Which pair of conditions represents STP?
Correct answer D. 0 °C and 760 mm Hg
According to the kinetic molecular theory, the average kinetic energy of gas molecules is directly proportional to the ____
Correct answer D. absolute temperature