Q. Which of the following factors does NOT affect the pressure of a gas?
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A.
Volume
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B.
Temperature
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C.
Number of moles
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D.
Color of the gas
Solution
The color of the gas does not affect its pressure; pressure is affected by volume, temperature, and number of moles.
Correct Answer: D — Color of the gas
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Q. Which of the following factors does NOT affect the rate of diffusion of a gas?
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A.
Molar mass
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B.
Temperature
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C.
Pressure
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D.
Volume of the container
Solution
The volume of the container does not affect the rate of diffusion of a gas; it is primarily affected by molar mass, temperature, and pressure.
Correct Answer: D — Volume of the container
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Q. Which of the following gases behaves most ideally under standard conditions?
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A.
NH3
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B.
CO2
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C.
He
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D.
H2O
Solution
Helium (He) behaves most ideally under standard conditions due to its low intermolecular forces.
Correct Answer: C — He
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Q. Which of the following gases has the highest density at STP?
Solution
CO2 has the highest density at STP among the given gases.
Correct Answer: D — CO2
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Q. Which of the following gases would have the highest rate of diffusion at a given temperature?
Solution
Hydrogen (H2) has the lowest molar mass and thus the highest rate of diffusion according to Graham's law.
Correct Answer: D — H2
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Q. Which of the following is NOT a postulate of the kinetic molecular theory?
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A.
Gas particles are in constant random motion
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B.
Gas particles have negligible volume
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C.
Gas particles attract each other
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D.
The average kinetic energy of gas particles is proportional to temperature
Solution
The kinetic molecular theory assumes that gas particles do not attract each other, which is why option 3 is NOT a postulate.
Correct Answer: C — Gas particles attract each other
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Q. Which of the following is not an assumption of the kinetic molecular theory?
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A.
Gas particles are in constant motion
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B.
Gas particles have no volume
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C.
Gas particles attract each other
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D.
Collisions between gas particles are elastic
Solution
The kinetic molecular theory assumes that gas particles do not attract or repel each other.
Correct Answer: C — Gas particles attract each other
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Q. Which of the following statements is true about real gases?
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A.
They obey the ideal gas law at all conditions
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B.
They have no volume
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C.
They experience intermolecular forces
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D.
They cannot be liquefied
Solution
Real gases experience intermolecular forces, which is why they deviate from ideal behavior under certain conditions.
Correct Answer: C — They experience intermolecular forces
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Q. Which of the following statements is true for real gases?
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A.
They obey the ideal gas law at all conditions
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B.
They have no volume
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C.
They experience intermolecular forces
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D.
They have a fixed shape
Solution
Real gases experience intermolecular forces, which causes deviations from ideal behavior.
Correct Answer: C — They experience intermolecular forces
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