- What is the effect on the volume of a gas if the number of moles is doubled at constant pressure and temperature?
A) Volume halves
B) Volume remains the same
C) Volume doubles
D) Volume quadruples
Answer: C) Volume doubles
Explanation: According to Avogadro’s Law, if the number of moles is doubled, the volume will also double at constant temperature and pressure.
- Which of the following describes a gas that has a compressibility factor less than 1?
A) The gas behaves ideally.
B) The gas is less compressible than an ideal gas.
C) The gas has stronger intermolecular attractions.
D) The gas cannot exist in a gaseous state.
Answer: C) The gas has stronger intermolecular attractions.
Explanation: A compressibility factor less than 1 indicates that the gas experiences significant attractive forces, making it less compressible than an ideal gas.
- Which of the following is true for an ideal gas undergoing isothermal expansion?
A) Temperature increases
B) Internal energy decreases
C) Work is done by the gas
D) Both B and C
Answer: D) Both B and C
Explanation: In isothermal expansion, the temperature remains constant, the internal energy of an ideal gas does not change, and work is done by the gas.
- What happens to the density of a gas if the pressure is increased and the temperature remains constant?
A) Density increases
B) Density decreases
C) Density remains constant
D) Density fluctuates
Answer: A) Density increases
Explanation: Density is directly proportional to pressure when temperature is held constant, so increasing pressure increases density.
- Which law states that for a fixed amount of gas at constant temperature, the volume is inversely proportional to the pressure?
A) Avogadro’s Law
B) Charles’s Law
C) Boyle’s Law
D) Gay-Lussac’s Law
Answer: C) Boyle’s Law
Explanation: Boyle’s Law states that the volume of a gas is inversely proportional to its pressure at constant temperature.
- If the temperature of an ideal gas is doubled while keeping pressure constant, what happens to the volume?
A) It halves
B) It remains the same
C) It doubles
D) It quadruples
Answer: C) It doubles
Explanation: According to Charles’s Law, if temperature increases while pressure remains constant, the volume will also increase proportionally.
- What does the term “STP” stand for in the context of gases?
A) Standard Temperature and Pressure
B) Standard Time and Pressure
C) Standard Temperature and Performance
D) Standard Tension and Pressure
Answer: A) Standard Temperature and Pressure
Explanation: STP refers to the standard conditions of temperature (0 °C or 273 K) and pressure (1 atm) for gases.
- In the Ideal Gas Law, what happens to the volume of a gas if its temperature is halved at constant pressure?
A) Volume doubles
B) Volume remains the same
C) Volume halves
D) Volume quadruples
Answer: C) Volume halves
Explanation: According to Charles’s Law, volume is directly proportional to temperature. If temperature is halved, volume also halves at constant pressure.
- If two different gases occupy the same volume at the same temperature and pressure, what can be inferred about their molar masses?
A) They must be the same.
B) One gas is heavier than the other.
C) Their molar masses are directly proportional to their densities.
D) Their molar masses are inversely proportional to their densities.
Answer: D) Their molar masses are inversely proportional to their densities.
Explanation: For gases at the same conditions, molar mass is inversely related to density, as density is defined as mass per unit volume.
- Which gas law can be used to calculate the final pressure of a gas if its volume decreases and temperature remains constant?
A) Avogadro’s Law
B) Dalton’s Law
C) Boyle’s Law
D) Charles’s Law
Answer: C) Boyle’s Law
Explanation: Boyle’s Law describes the inverse relationship between pressure and volume at constant temperature.
Leave a comment