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 Β· page 22 of 23
- A. Avogadro constant; Boltzmann constant
- B. Avogadro constant; Molar gas constant
- C. Total number of molecules; Boltzmann constant
- D. Total number of molecules; Avogadro constant
Explanation: In the ideal gas equation pV = NkT, 'N' represents the total number of molecules of gas, while 'k' represents the Boltzmann constant.
Correct answer: Total number of molecules; Boltzmann constant- A. 10 atm, 25 atm, 15 atm
- B. 10 atm, 15 atm, 25 atm
- C. 25atm, 10 atm, 15 atm
- D. 15 atm, 25 atm, 10 atm
Explanation: Simplify 20:30:50 to get 10:15:25To find the partial pressures of each gas, we need to calculate the pressure contributed by each gasβ¦
Correct answer: 10 atm, 15 atm, 25 atm- A. Pπ = ππ T
- B. ππ = ππ T
- C. πππ = ππ T
- D. All of the above
Explanation: The correct equation to describe the behavior of ideal gases under standard conditions is PV = nRT.
Correct answer: Pπ = ππ T- A. rNH3 /rCO2 =1/1.6
- B. rNH3 /rCO2 =1.6/1
- C. rCO2 /rNH3 = 1/1.6
- D. None of these
Explanation: In this question, we don't have to apply Grahm's law cuz it is far simple What they said, rNH3=1.6(rCO2) ,the questions word in equationβ¦
Correct answer: rNH3 /rCO2 =1.6/1- A. Helium
- B. Hydrogen
- C. Nitrogen
- D. Neon
Explanation: This concept is related to the process of effusion.Effusion is the process in which a gas escapes from a container through a hole of aβ¦
Correct answer: Hydrogen- A. diffusion
- B. viscosity
- C. density
- D. none of the above
Explanation: Diffusion is the net movement of gases from a region of higher concentration to a region of lower concentration.
Correct answer: diffusion- A. at the center of the tube
- B. near the NH3 bottle
- C. near the HCl bottle
- D. throughout the length of the same tube
Explanation: When connecting the two bottles, the two gases will diffuse into each other.The rate of diffusion is inversely proportional to the squareβ¦
Correct answer: near the HCl bottle- A. H
- B. He
- C. Ne
- D. Xe
Explanation: Hydrogen is the only gas listed that is diatomic, meaning its molecules consist of two atoms (H2).
Correct answer: H- A. 8.0 ms-1
- B. 6.0 ms-1
- C. 5.0 ms-1
- D. 7.0 ms-1
Explanation: To find the root-mean-square (RMS) speed of the gas molecules, use the formula:Vrms = β((v1^2 + v2^2 + v3^2 + v4^2) / total number ofβ¦
Correct answer: 8.0 ms-1- A. The plasma contains an equal amount of positive and negative charges and is almost neutral as a whole.
- B. Plasma exists in the atmosphere of stars.
- C. Plasma exists in the region around the sun.
- D. There is less matter in the plasma state than in the solid, liquid, and gaseous states.
Explanation: Plasma is the highest energy state of matter. It consists of a collection of free-moving electrons, positive ions and neutral particles.
Correct answer: There is less matter in the plasma state than in the solid, liquid, and gaseous states.- A. The average kinetic energy of the molecules depends on the volume in which the gas is enclosed.
- B. The average kinetic energy of the molecules in the gaseous state is proportional to the pressure.
- C. The average kinetic energy of the molecules in the gaseous state is proportional to the temperature.
- D. All of the above
Explanation: Kinetic energy is the energy a substance has because of its molecules being in motion, as a substance absorbs heat its molecules moveβ¦
Correct answer: The average kinetic energy of the molecules in the gaseous state is proportional to the temperature.- A. Hydrogen, 4O2
- B. Hydrogen, 2O2
- C. Oxygen, 8H2
- D. Oxygen, 3H2
Explanation: The balanced chemical equation for the reaction between oxygen gas and hydrogen gas is:O2 + 4H2 β 2H2OAccording to this equation, forβ¦
Correct answer: Hydrogen, 2O2- A. 50 amu
- B. 25 amu
- C. 16 amu
- D. 8 amu
Explanation: Graham found experimentally that the rate of diffusion of a gas is inversely proportional to the square root of the mass of its particles.
Correct answer: 8 amu- A. Hydrogen
- B. Nitrogen
- C. Methane
- D. Sulphur dioxide
Explanation: For gas to deviate from ideal behavior, there should be significant intermolecular forces present in the gas.
Correct answer: Sulphur dioxide- A. High temperature only
- B. High pressure only
- C. High pressure and low temperature
- D. Low pressure and high temperature
Explanation: High pressure and low temperature: Both high pressure and low temperature amplify intermolecular forces, leading to greater deviationsβ¦
Correct answer: High pressure and low temperature- A. Bronstect effect
- B. Joule Thomson effect
- C. Graham's effect
- D. Dalton's effect
Explanation: Therefore, the correct term is the "Joule-Thomson effect," which describes the cooling observed when a gas expands rapidly without anyβ¦
Correct answer: Joule Thomson effect- A. Xe
- B. H2
- C. CO2
- D. He
Explanation: Helium is an inert gas that exists as a single atom, resulting in the lowest conceivable van der Waals dispersion forces.
Correct answer: He- A. I, II, and III
- B. I and II only
- C. I and III only
- D. II and III only
Explanation: More significantly, the Van der Waals equation takes into consideration the molecular size and molecular interaction forces (attractiveβ¦
Correct answer: II and III only- A. Pressure
- B. Volume
- C. Temperature
- D. Concentration
Explanation: The compressibility factor (Z) is a measure of how much a gas deviates from ideal gas behavior.
Correct answer: Volume- A. 22.4 dm3
- B. 2.24 dm3
- C. 4.48 dm3
- D. 44.8 dm3
Explanation: Moles of N 2 =2.8/28=0.1 moleAtS.T.P: moleβ22.4 L β΄0.1 mole β2.24 L=2240 ml=2240cc=2.24 dm3
Correct answer: 2.24 dm3