Free Ideal Gas Equation MCQs with Answers
94 Ideal Gas Equation MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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94 questions · page 4 of 5
- A. 11.2 dm3
- B. 22.4 dm3
- C. 33.6 dm3
- D. 44.8 dm3
Explanation: 273K=0°C is the standard temperature. Moles of methane=mass/mr=8/(12+4)=0.5mol Volume=molxVolume at STP=0.5x22.4=11.2dm3 Moles of…
Correct answer: 33.6 dm3- A. Energy
- B. Force
- C. Energy per unit volume
- D. Force per unit volume
Explanation: The correct option is C as pressure and Energy per unit volume have the same dimensions that are ML-1T-2
Correct answer: Energy per unit volume- A. 1.989
- B. 8.314
- C. 0.0821
- D. 62400
Explanation: At STP, following are values of R in different units 0.0821 atm dm3 K-1 mol -1 8.31 Nm K-1 mol-1 8.31 J K-1 mol-1 7.989 cal K-1 mol-1
Correct answer: 0.0821- A. Units of pressure
- B. Units of volume
- C. Units of Temperature
- D. All of the above
Explanation: It is a constant and does not depend on other factors like temperature,pressure and volume.
Correct answer: All of the above- A. Remains same
- B. Becomes double
- C. Becomes half
- D. increases four times
Explanation: volume of a given amount of gas is directly proportional to the change in temperature (charles law)and inversely proportional to the…
Correct answer: Remains same- A. Increased four times
- B. Decreased four times
- C. Remained unchanged
- D. Reduced to one half
- E. Increased two times
Explanation: PV=nRT V=nRT/P If temperature is halved and pressure is doubled then V=n x R x 0.5T/2P = V=¼(nRT/P) Hence, volume is decreased four times.
Correct answer: Decreased four times- A. 1 atm, 0°C
- B. 2 atm, 10°C
- C. 3 atm, 546K
- D. All same
Explanation: Gas density is affected by both pressure and temperature according to the ideal gas law, PV = nRT.
Correct answer: 2 atm, 10°C- A. 8.3143 JK⁻¹mol⁻¹
- B. 0.0821 dm³atom mol⁻¹K⁻¹
- C. 8.3143 Jmol⁻¹
- D. 0.0821 dm³tor K⁻¹mol⁻¹
Explanation: The SI unit of R (the ideal gas constant) in the General Gas equation (PV = nRT) is 8.3143 J K⁻¹ mol⁻¹ (Joules per Kelvin per mole).
Correct answer: 8.3143 JK⁻¹mol⁻¹- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The general gas equation, also known as the ideal gas equation, is a mathematical equation that describes the relationship between…
Correct answer: Option D- A. 8.314 atm dm3 mol K-1
- B. 0.0821 Jmol-1 K-1
- C. 62.4 torr cm3 mol-1K-1
- D. 8.314 x 10^7erg mol-1K-1
Explanation: R=8.3143 Nm.mol-1.K-1 1Nm=107erg Hence,8.3143*107erg.mol-1K-1
Correct answer: 8.314 x 10^7erg mol-1K-1- A. 100 dm3
- B. 75 dm3
- C. 19.5 dm3
- D. 51 dm3
Explanation: To find the volume of the gas at STP (Standard Temperature and Pressure), we apply the combined gas law equation:(P1 * V1) / T1 = (P2 *…
Correct answer: 19.5 dm3- A. 54 K
- B. 600 K
- C. 54 °C
- D. 600 °C
Explanation: The explanation for this question will be added soon.
Correct answer: 600 K- A. 8.314 J mol-3K-3
- B. 1.38J mole-1 K-3
- C. 1.38J mole-1 K-1
- D. 8.314 J mole-1 K-1
Explanation: Physically, the gas constant is the constant of proportionality that relates the energy scale in physics to the temperature scale, when a…
Correct answer: 8.314 J mole-1 K-1- A. P = nRT
- B. PV = RT
- C. V = nRTP
- D. PV = nRT
Explanation: According to the Ideal Gas equation: The product of Pressure & Volume of a gas bears a constant relation with the product of Universal gas…
Correct answer: PV = nRT- A. PV=nRT
- B. PT=nRv
- C. P=nRT
- D. T=npv/R
Explanation: The ideal gas equation is formulated as: PV = nRT. In this equation, P refers to the pressure of the ideal gas, V is the volume of the…
Correct answer: PV=nRT- A. Temperature is lowered & pressure is increased
- B. Temperature is increased & pressure is lowered
- C. Temperature & pressure both are lowered
- D. Temperature & pressure both are increased
Explanation: To prevent the volume of a given gas from expanding when its mass is increased, you should lower the temperature and increase the pressure…
Correct answer: Temperature is lowered & pressure is increased- A. Volume
- B. Temperature
- C. Pressure
- D. Number of motes
Explanation: While each of these variables (volume, temperature, pressure) can change in different gas laws, the number of moles (n) is generally…
Correct answer: Number of motes- A. Cannot be predicted
- B. Is reduced to 1/2
- C. Remains unchanged
- D. Is doubled
Explanation: Temp is directly proportionsl to pressure and pressure is inversely proportional to volume.
Correct answer: Remains unchanged- A. Temperature and pressure is increased
- B. Temperature is lowered and pressure is decreased
- C. Temperature and pressure is decreased
- D. Temperature is lowered and pressure is increased
Explanation: Option A: Temperature and pressure increased is incorrect because increasing the temperature and pressure would cause the gas to expand…
Correct answer: Temperature is lowered and pressure is increased- A. 8.314 Jmol-1K-1
- B. 8.314 dm 3atm mol-IK-I
- C. 0.0821 dm3atm mol-I K-1
- D. 0.0821 Jmol-1K-1
Explanation: a) 8.314 J mol^(-1) K^(-1)Explanation: This option suggests that the value of the universal gas constant in SI units is 8.314 J mol^(-1)…
Correct answer: 8.314 Jmol-1K-1