Kinetic Theory of Gases
Q. Which of the following statements about RMS speed is true?
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A.
RMS speed is always greater than average speed
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B.
RMS speed is always less than average speed
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C.
RMS speed equals average speed
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D.
RMS speed is independent of molecular mass
Solution
The RMS speed is always greater than the average speed for a distribution of speeds in a gas.
Correct Answer: A — RMS speed is always greater than average speed
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Q. Which of the following statements is true about real gases compared to ideal gases?
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A.
Real gases obey gas laws perfectly
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B.
Real gases have no intermolecular forces
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C.
Real gases occupy no volume
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D.
Real gases deviate from ideal behavior at high pressure
Solution
Real gases deviate from ideal behavior at high pressures and low temperatures due to intermolecular forces and finite volume.
Correct Answer: D — Real gases deviate from ideal behavior at high pressure
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Q. Which of the following statements is true about the behavior of real gases?
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A.
They obey gas laws perfectly
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B.
They have no volume
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C.
They experience intermolecular forces
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D.
They are always ideal
Solution
Real gases experience intermolecular forces and do not behave ideally under all conditions.
Correct Answer: C — They experience intermolecular forces
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Q. Which of the following statements is true about the kinetic molecular theory of gases?
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A.
Gas particles have significant volume
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B.
Gas particles attract each other
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C.
Gas particles are in constant random motion
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D.
Gas particles do not collide
Solution
The kinetic molecular theory states that gas particles are in constant random motion.
Correct Answer: C — Gas particles are in constant random motion
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Q. Which of the following statements is true according to the kinetic theory of gases?
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A.
Gas molecules occupy a fixed volume.
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B.
Gas molecules have significant attractive forces between them.
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C.
Gas molecules are in constant random motion.
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D.
Gas molecules do not collide with each other.
Solution
According to the kinetic theory, gas molecules are in constant random motion, which is a fundamental assumption of the theory.
Correct Answer: C — Gas molecules are in constant random motion.
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Q. Which of the following statements is true regarding RMS speed?
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A.
It is always greater than average speed.
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B.
It is always less than average speed.
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C.
It is equal to average speed.
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D.
It depends on the gas type.
Solution
RMS speed is always greater than average speed for a gas due to the nature of the calculations involved.
Correct Answer: A — It is always greater than average speed.
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Q. Which of the following statements is true regarding the mean free path of gas molecules?
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A.
It increases with increasing temperature.
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B.
It decreases with increasing pressure.
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C.
It is independent of the size of the gas molecules.
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D.
It is constant for all gases.
Solution
The mean free path decreases with increasing pressure because more molecules are present in a given volume, leading to more frequent collisions.
Correct Answer: B — It decreases with increasing pressure.
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