Free Real and Ideal Gases MCQs with Answers
97 Real and Ideal 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.
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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97 questions · page 4 of 5
- A. Ne and CO
- B. H₂ and He
- C. CO₂ and CO
- D. H₂ and O₂
Explanation: Hydrogen and Helium are the smallest of all elements. They are non-polar in nature; it is not easy to operate attractive forces between…
Correct answer: H₂ and He- A. He
- B. CO2
- C. H2
- D. N2
Explanation: Carbon dioxide is a linear molecule consisting of one carbon atom bonded to two oxygen atoms.
Correct answer: CO2- A. Highly stable
- B. Covalent Molecule
- C. Highly reactive
- D. Carbon molecule
Explanation: In CO2, carbon, and oxygen first form a double covalent bond. At first, oxygen and carbon share their two valence electrons.
Correct answer: Covalent Molecule- A. Easy to be liquified
- B. Having higher critical temperature
- C. Less soluble in water
- D. None
Explanation: A gas having high value of coefficient of attraction is tough to be liquified.
Correct answer: Easy to be liquified- A. 2.71 A
- B. 2.71 nm
- C. 5.42 A0
- D. 542 A0
Explanation: According to the following solution this correct answer is 2.71Ao.
Correct answer: 2.71 A- A. the constant 'a' is negligible and not 'b'
- B. the constant 'b' is negligible and not 'a'
- C. both constants 'a' & 'b' are negligible
- D. both the constants 'a' & 'b' are not negligible
Explanation: At low pressure, b can be ignored as the volume of the gas is very high.
Correct answer: the constant 'a' is negligible and not 'b'- A. No force of attraction between molecules
- B. No example in nature
- C. Can be liquefied easily
- D. Obey gas laws at all conditions of temperature and pressure
Explanation: Ideal gases cannot be liquefied easily. This is because ideal gases have no intermolecular forces, which are the forces that hold…
Correct answer: Can be liquefied easily- A. N2
- B. CO2
- C. NH3
- D. SO2
Explanation: the non ideal behaviour of a gas depends on two factors: 1. intermolecular forces 2.
Correct answer: N2- A. Low temperature and low pressure
- B. Standard temperature and standard pressure
- C. Low temperature and high pressure
- D. High temperature and low pressure
Explanation: Real gases behave most like ideal gases under conditions of high temperature and low pressure.When the temperature is high,the kinetic…
Correct answer: High temperature and low pressure- A. Its critical temperature is always above 0°C
- B. Its molecules are smaller in size
- C. It solidifies before becoming a liquid
- D. Forces between its molecules are negligible
Explanation: An ideal gas cannot be liquefied because intermolecular forces are negligible.For a gas to be converted into a liquid state,it should have…
Correct answer: Forces between its molecules are negligible- A. Zero
- B. Less than one
- C. Greater than one
- D. Equal to one
Explanation: For an ideal gas,the value of compressibility factor is one.While for real gas,it is greater or less than one.
Correct answer: Equal to one- A. Nm-4mol-2
- B. Nm+6mol-2
- C. Nm+4mol-2
- D. Nm+2 mol-2
Explanation: Nm+2 mol-2 is the unit of gas constant a
Correct answer: Nm+4mol-2- A. The molecules of the gas are big sized
- B. Gas is sufficiently polar.
- C. Least attractive forces are present among the molecules of the gas
- D. The gases are non-ideal
Explanation: Very small values of Van der Waal's constant in his equation for a particular gas show that least attractive forces are present among the…
Correct answer: Least attractive forces are present among the molecules of the gas- A. Two
- B. Three
- C. Four
- D. Eight
Explanation: It is interesting to know that the excluded volume b is not equal to the actual volume of gas molecules.In fact,it is four times the…
Correct answer: Four- A. Helium
- B. Hydrogen
- C. Oxygen
- D. Ammonia
Explanation: 'a' is coefficient of attraction or attraction per unit volume.Since ammonia has hydrogen bonding (strong intermolecular forces of…
Correct answer: Ammonia- A. Helium
- B. Ammonia
- C. Oxygen
- D. CO2
Explanation: Correct. Ammonia has a high critical temperature of ~405.5 K because of strong hydrogen bonding between its molecules, which increases…
Correct answer: Ammonia- A. high temperature and low pressure
- B. low temperature and high pressure
- C. standard temperature and pressure
- D. any temperature, equally
Explanation: Compressing a gas brings the molecules close enough for their own volume and their mutual attractions to matter, and cooling reduces the…
Correct answer: low temperature and high pressure- A. Pressure = high density = high
- B. Pressure = low density = high
- C. Pressure = high density = low
- D. Pressure = low density = low
Explanation: The physically correct condition is low pressure and high temperature, which corresponds to low density.
Correct answer: Pressure = low density = high- A. Pressure = high density = high
- B. Pressure = low density = high
- C. Pressure = hight density = low
- D. Pressure = low density = low
Explanation: Real gases approximate ideal gas behavior at relatively low density, low pressure, and high temperature.At high temperatures, the gas…
Correct answer: Pressure = low density = low- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: At low pressure P, volume V is high. V-b will approximately be equal to V so b is neglegibe.
Correct answer: Option B