Free Gases MCQs with Answers
443 Gases MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Gas behaviour is explained through the kinetic molecular theory and the relationships among pressure, volume and temperature. Work includes STP, Boyle's and Charles's laws, absolute zero, the ideal gas equation, and the distinction between ideal and real gases, especially the effects of intermolecular forces and molecular volume.
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443 questions · page 10 of 23
- A. 8.314 Jmole K
- B. 8.314 J/mol K
- C. 8.314 Jmole K^−1
- D. 3.148 J/moleK
Explanation: The value of the universal gas constant (R) is approximately 8.314 J/mol K8.314J/mol K.
Correct answer: 8.314 J/mol K182. At constant temperature when the volume of the given mass of gas is doubled, its density becomes
- A. Double
- B. One fourth
- C. Four times
- D. Half
Explanation: At constant temperature, the density of a gas is inversely proportional to its volume.
Correct answer: Half- A. Increases by factor 4
- B. Decreases by factor 4
- C. Increases by factor 2
- D. Decreases by factor 2
Explanation: According to Gay-Lussac's Law (P ∝ T at constant volume), pressure is directly proportional to the absolute temperature.
Correct answer: Increases by factor 4- A. Volume = decrease temperature = decrease
- B. Volume = decrease temperature = increase
- C. Volume = increase temperature =decrease
- D. Volume = increase temperature = increase
Explanation: Option: A As volume and temperature are directly proportional to each other, so, by decreasing volume, temperature will also decrease.
Correct answer: Volume = decrease temperature = decrease- A. Number of atoms in the gas
- B. Number of moles of the gas
- C. Number of nucleons
- D. Number of molecules of gas
Explanation: In the equation of state of an ideal gas PV=nRT; P is the absolute pressure of the gas in Pascals, V is the volume occupied by the gas in…
Correct answer: Number of moles of the gas- A. Volume = decrease, temperature = decrease
- B. Volume = decrease, temperature = increase
- C. Volume = increase, temperature = decrease
- D. Volume = increase, temperature = increase
Explanation: When the volume of an ideal gas is increased while keeping it in a closed container, the pressure of the gas decreases.
Correct answer: Volume = increase, temperature = decrease- A. 8.314 J/molK
- B. 1.38 x 10^-23 J/K
- C. 6.63 x 10^-11 Nm2/kg2
- D. 1.6 x 10^-19 C
Explanation: The value of R at atm that is at standard atmospheric pressure is R = 8.3144598 J. mol-1 K-1.
Correct answer: 8.314 J/molK- A. nR/P
- B. nRP
- C. n/ RP
- D. nP / R
Explanation: Correct Option: A it is the correct gradient of graph. using the general gas equation PV = nRTV/T = nR/P
Correct answer: nR/P- A. Number of molecules and atoms (particle) of gas
- B. Number of moles of the gas
- C. Number of nucleons
- D. Number of protons
Explanation: The ideal gas law states that PV = NkT, where P is the absolute pressure of a gas, V is the volume it occupies, N is the number of atoms…
Correct answer: Number of molecules and atoms (particle) of gas- A. 131.1
- B. 1.311
- C. 1.212
- D. 122.1
Explanation: Mass of gas = 1.25 g The volume of gas = 2.50 x 102 ml= 0.25 L Pressure of gas = 715 torr The temperature of gas = Using the ideal gas…
Correct answer: 131.1- A. Pressure
- B. Temperature
- C. Molar Mass
- D. All of these
Explanation: According to the ideal gas law Density = pM / RT where p represents Pressure, M is for the Molar mass, R is the Ideal gas constant and T…
Correct answer: All of these- A. 4V
- B. 2V2
- C. V/4
- D. 8V
Explanation: According to the formula PV=nRT, The pressure becomes p/2 and the temperature becomes 2T. Therefore the increase in volume will be 4V.
Correct answer: 4V- A. 450 K
- B. 800 K
- C. 600 K
- D. 900 K
Explanation: So we know that, P₁V₁ / P₂V₂ = W₁T₁ / W₂T₂ Substituting in the above formula we get, => 1 × 1 / 0.75 × 1 = 2 × 300 / 1 × T₂ => 1 / 0.75 =…
Correct answer: 450 K- A. 50
- B. 90
- C. 180
- D. 200
Explanation: We will use Boyle's law for the relationship between volume and pressure.
Correct answer: 200- A. Dalton's Law
- B. Avogadro's Law
- C. General gas equation
- D. Van der Waals equation
Explanation: PV=nRT is a General gas equation for an ideal gas equation. Avagadro's law is V1n2=V2n1, Dalton's law is Ptotal=P1+P2+P3..., Van der Waal…
Correct answer: General gas equation- A. 0.0821dm3 atm k mol-1.
- B. 803143 Nmk-Imole
- C. 0.0821 dm3 atm k-I mol-1
- D. 8.3143 dm3 atm k-I mol
Explanation: The value of R is different for different units of volume and pressure.
Correct answer: 0.0821 dm3 atm k-I mol-1- A. Pascal's law
- B. Dalton's law
- C. Charles's law
- D. Bohr's law
Explanation: When animals inhale air, oxygen will move into the lungs due to the difference in partial pressure of oxygen in the lungs and atmosphere.
Correct answer: Dalton's law198. 273 mL of a gas at STP was taken to 27oC and 600 mm pressure. The final volume of the gas would be:
- A. 273 mL
- B. 300 mL
- C. 380 mL
- D. 586 mL
Explanation: The correct answer is '380 mL'. You can use the following image as the solution. As it is a numerical it can have one answer.
Correct answer: 380 mL199. Which of the following is the correct equation to calculate the relative molecular mass of a gas?
- A. M = mPR / VT
- B. M = PV / mRT
- C. M = mPRT / V
- D. M = mRT / PV
Explanation: Since PV=NRT where n = m / M PV=MRT / M M=mRT / PV.
Correct answer: M = mRT / PV- A. 601 K
- B. 373 K
- C. 555 K
- D. 327 K
Explanation: According to the ideal gas equation PV = nRT;we can say that pressure is directly proportional to temperature.In this case, when pressure…
Correct answer: 601 K