Free Kinetic Molecular Theory MCQs with Answers
122 Kinetic Molecular Theory MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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122 questions · page 5 of 7
- A. Shrunk
- B. Enlarged
- C. Completely collapsed size
- D. Remain unchanged in size
Explanation: When a balloon filled with ethyne is pricked with a sharp pointed needle and quickly dropped in a tank of H2 gas under identical…
Correct answer: Enlarged- A. A is at temperature T and B at T',T', T'
- B. A is lowered to a temperature T2,T2< T while B is at T
- C. Both A and B are raised to a higher temperature
- D. Both A and B are placed at lower temperature
Explanation: For two gases A and B with molecular weights MA and MB, it is observed that at a certain temperature T1, the mean velocity of A is equal…
Correct answer: A is lowered to a temperature T2,T2< T while B is at T- A. N molecules of O2
- B. 3N molecules of O2
- C. N/2 molecules of O2
- D. N/3 molecule of O2
Explanation: The solution for this question is given below:
Correct answer: N molecules of O2- A. Two times less than a hydrogen molecule
- B. Two times that of hydrogen molecule
- C. Four times that of a hydrogen molecule
- D. The same as a hydrogen molecule
Explanation: The average kinetic energy of an atom is given as 3/2 KT. ∴ It does not depend on the mass of the atom.
Correct answer: The same as a hydrogen molecule85. At normal conditions, Dalton's law of partial pressure is not applicable to which gaseous mixture:
- A. H2 and Cl2 mixture
- B. He and N2 mixture
- C. H2 and CH4 mixture
- D. CO2 and O2 mixture
Explanation: At ordinary conditions H2 and Cl2 reacts to form HCl acid. Dalton's law of partial pressure is applies only to gasses that do not react…
Correct answer: H2 and Cl2 mixture- A. Translational motion
- B. Rotational motion
- C. Vibrational motion
- D. Rotational and vibrational motion
Explanation: A mono-atomic substance can store energy only in the form of translational motion.
Correct answer: Translational motion- A. They are highly compressible.
- B. They only have vibrational motion.
- C. Sudden expansion of gases cause cooling.
- D. They exert pressure on the walls of the vessel.
Explanation: Gases have vibrational,translational and rotational motions.
Correct answer: They only have vibrational motion.- A. Rotational K.E
- B. Translational K.E
- C. Vibrational K.E
- D. None of these
Explanation: The absolute temperature of a gas is directly proportional to the average translational kinetic energy of its molecules.This relationship…
Correct answer: Translational K.E- A. The pressure of the gas increases
- B. The kinetic energy of gas molecules increases
- C. The rate of collision increases
- D. The number of moles of the gas increases
Explanation: Increasing the temperature will increase the pressure at constant volume of gas.It will also increase kinetic energy of gases due to which…
Correct answer: The number of moles of the gas increases- A. Rapid intermolecular collisions
- B. Molecular impacts against the walls of vessel
- C. Voids between the gas molecules
- D. Ideal behaviour of gases
Explanation: The pressure of a gas is due to collisions of gas molecules against the walls of container.It is a postulate of KMT.
Correct answer: Molecular impacts against the walls of vessel- A. SO2
- B. N2
- C. O2
- D. Cl2
Explanation: The rms velocity is inversaly proportional to square root of molecular mass.So,the gas with highest molecular mass will have lowest rms…
Correct answer: Cl2- A. Two times less than a hydrogen molecule
- B. Two times that of a hydrogen molecule
- C. Four times that of a hydrogen molecule
- D. The same as a hydrogen molecule
Explanation: According to the kinetic theory of gases, the average translational kinetic energy of gas particles depends only on the absolute…
Correct answer: The same as a hydrogen molecule- A. SO2
- B. N2
- C. O2
- D. Cl2
Explanation: The root-mean-square velocity of a gas is inversely proportional to the square root of its molar mass at a constant temperature.
Correct answer: Cl2- A. Gas is at high pressure
- B. Collision between particles are elastic
- C. There are weak forces of attraction between particles in gas
- D. Total energy of particles is proportional to the temperature
Explanation: The five main postulates of the KMT are as follows: (1) The particles in a gas are in constant, random motion.
Correct answer: Collision between particles are elastic- A. Increases on increasing temperature
- B. Decreases on increasing temperature
- C. Unchanged on changing temperature
- D. Increases some where and decreases
Explanation: The average distance covered by the gas between successive collisions is known as mean free path.The formula given below clearly denotes…
Correct answer: Increases on increasing temperature- A. 2.44
- B. 23.2
- C. 48.93
- D. 2.32
Explanation: The ratio of the rate of diffusion of the given gases is 0.58:0.55 or 1.112.
Correct answer: 48.93- A. 4
- B. 16
- C. 10.5
- D. 30
Explanation: According to Graham's law of diffusion; RH2/RO2 = √MO2/ √MH2 RH2/RO2 = √32/√2 = 4. Hence, the correct option is A.
Correct answer: 4- A. Plasma state
- B. Liquid state
- C. Solid state
- D. Super condensed state
Explanation: a) Plasma state:In intense electric fields and at very high temperatures, matter can exist in a plasma state.
Correct answer: Plasma state- A. 16
- B. 36
- C. 6
- D. 24
- E. 72
Explanation: The explanation for this question will be added soon.
Correct answer: 72- A. Solids
- B. Liquid
- C. Gases
- D. All of these options are correct
Explanation: Gases have the weakest intermolecular forces while these forces are at intermediate level in liquids and strongest in solids.
Correct answer: Gases