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 20 of 23
- A. High
- B. Low
- C. Moderate
- D. Same
Explanation: Effusion is the movement of a gas, from a region of high pressure, through an extremely small opening of molecular size into a region of…
Correct answer: Low- A. Low temperature
- B. High temperature
- C. Low pressure
- D. High pressure
Explanation: Plasma is an ionized gas that only occurs at "high temperatures" so it is difficult to maintain it at "low temperatures".
Correct answer: Low temperature- A. H2
- B. He
- C. N2
- D. CO
Explanation: The real gas that acts most like an ideal gas is helium. Because it exists in a single atom and its vander waals forces are very low.
Correct answer: He- A. Freezing effect
- B. Joule Thomson effect
- C. Boyles effect
- D. J Perrin effect
Explanation: Joule-Thomson effect, also called Joule-Kelvin effect, the change in temperature that accompanies expansion of a gas without production of…
Correct answer: Joule Thomson effect- A. H2
- B. N2
- C. CO2
- D. Cl
Explanation: The least value of van der waal cont is of H2 because of its small size and non polar character i.e, 0.245 atm dm3/mol.
Correct answer: H2- A. Expansion factor
- B. Depression factor
- C. Compressibility factor
- D. Diffusion factor
Explanation: Compressibility Factor is also often defined as "the ratio of molar volume of gas to that of an ideal gas." It is expressed as Z = pV /…
Correct answer: Compressibility factor- A. Freezing effect
- B. Joule Thomson effect
- C. Boyle's effect
- D. J.Perrin effect
Explanation: Answer: B Joule Thomson effect is the phenomenon accompanying a change in temperature due to a rapid change in the volume of a gas (rapid…
Correct answer: Joule Thomson effect- A. 95.56g/dm3
- B. 64.51 g/dm3
- C. 74.42g/dm3
- D. 99.9 g/dm3
Explanation: The critical volume of oxygen 74.42 cm3/mol. So the correct answer is C.
Correct answer: 74.42g/dm3- A. 273.16 K and 1 atm
- B. 0oC & 1 mm Hg
- C. 273.16oC & 1 atm
- D. 0 K & 1 atm
Explanation: The standard temperature and pressure are 273.16K (0oC) and 1 atm. All the remaining options are incorrect.
Correct answer: 273.16 K and 1 atm- A. 2.24 dm3
- B. 6.44 dm3
- C. 1.12 dm3
- D. 112 dm3
Explanation: First, we find out the number of moles using the formula moles = mass/MrMr of nitrogen will be 14+14 = 28So 8/28 = 0.28Then we use volume…
Correct answer: 6.44 dm3- A. Atm
- B. Pascal
- C. mm of Hg
- D. Millibar
Explanation: Correct option is D. Meteorologists use a metric unit for pressure called a millibar.
Correct answer: Millibar- A. 10-4 K
- B. 10-2 K
- C. 10-1 K
- D. 10-5 K
Explanation: Explanation:Current attempts have resulted in temperature as low as 10-5 K. Hence, the correct answer is D.
Correct answer: 10-5 K- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Boyles law states that at a fixed temperature, the volume of gas is inversely proportional to the pressure exerted by the gas.
Correct answer: Option B- A. Pressure will become one half
- B. The volume will be increased
- C. Temperature has no effect on freely moving molecules
- D. Colliding capability of molecule will become lower
Explanation: According to Charles's law, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature, if the…
Correct answer: The volume will be increased- A. 6 atm
- B. 4 atm
- C. 2 atm
- D. 1 atm
Explanation: Use the combined gas law.P₁V₁/T₁ = P₂V₂/T₂P₁ = initial pressure = 3 atmV₁ = initial volume = 100 m³T₁ = initial temperature= 27° C+273.15…
Correct answer: 2 atm- A. Dalton's Law
- B. Charles's Law
- C. Boyle's Law
- D. Graham's Law
Explanation: Explanation:Dalton's law states that the total pressure exerted by a mixture of non reacting gases is equal to the sum of their individual…
Correct answer: Dalton's Law- A. 8.314 Jmol-2K-1
- B. 1.38 Jmol-1 K-2
- C. 1.38 Jmol-1K-1
- D. 8.314 Jmol-1 K-1
Explanation: Explanation: The value of the universal gas constant R depends on the units of pressure, volume, and temperature used.
Correct answer: 8.314 Jmol-1 K-1- A. 67.8 x100 / 50
- B. 50 x 100 / 100
- C. 67.8 X 50/ 100
- D. 67.8 +50/ 100
Explanation: To find the partial pressure of H2, we need to calculate the pressure contributed by H2 gas based on its percentage in the mixture.
Correct answer: 67.8 X 50/ 100- A. qV=nRt
- B. pV=nRt
- C. gV=nRt
- D. yV=nRt
Explanation: PV=nRTP = Pressure of the gasV = Volume of the gasn = Number of moles of gasR = Universal gas constant (8.314 J/mol·K)T = Temperature in…
Correct answer: pV=nRt- A. Graham's
- B. Charles's
- C. Boyle's
- D. None of these
Explanation: Effusion refers to the movement of gas particles through a small hole. Graham's Law states that the effusion rate of a gas is inversely…
Correct answer: Graham's