Free Kinetic Molecular Theory MCQs with Answers

• A. Gas molecules attract one another strongly
• B. The volume of the molecules themselves is negligible compared with the volume of the container
• C. Collisions between molecules lose energy as heat
• D. The molecules all move at the same speed

Explanation: The ideal model treats molecules as point masses with negligible volume and no intermolecular forces, colliding perfectly elastically so…

• A. pressure
• B. absolute temperature
• C. volume
• D. molar mass

Explanation: Average kinetic energy equals three halves of kT, so it is fixed by absolute temperature alone.

• A. Gas molecules are in constant random motion
• B. Collisions between molecules are perfectly elastic
• C. There are strong attractive forces between gas molecules
• D. The volume of the molecules is negligible compared with the volume of the container

Explanation: An ideal gas is defined by the absence of intermolecular forces, which is precisely why it obeys the gas laws exactly.

• A. the weight of the gas molecules
• B. collisions of the molecules with the walls
• C. attraction between molecules and the walls
• D. the chemical reaction of the gas with the walls

Explanation: Each collision delivers a small impulse, and the enormous number of collisions per second averages out into a steady pressure.

• A. directly proportional to its molar mass
• B. inversely proportional to the square root of its molar mass
• C. independent of its molar mass
• D. proportional to the square of its molar mass

Explanation: Lighter molecules move faster at a given temperature, so hydrogen diffuses four times as fast as oxygen, whose molar mass is sixteen times…

• A. Boyle's law
• B. Charles's law
• C. Gay-Lussac's law
• D. Avogadro's law

Explanation: Gay-Lussac's law covers the pressure temperature relationship at constant volume, and it explains why a sealed aerosol can explode when…

• A. the identity of the gas
• B. the absolute temperature
• C. the pressure
• D. the volume of the container

Explanation: At the same temperature, hydrogen and oxygen molecules have the same average kinetic energy, though the lighter hydrogen molecules must…

• A. increases by two times
• B. increases by four times
• C. decreases by two times
• D. decrease by four times

Explanation: The average translational kinetic energy of gas molecules is proportional to the square of their speed, KE = 1/2 mv^2.

• A. Straight
• B. Parabolic
• C. Zig-zag
• D. Hyperbolic

Explanation: Kinetic molecular theory assumes that gas particles move continuously in straight lines between collisions.

• A. Bohr's Theory
• B. Dalton's Theory
• C. Kinetic Molecular Theory
• D. None

Explanation: Kinetic molecular theory explains the behaviour of matter by relating its macroscopic properties to the motion and collisions of…

• A. H2 at -73oC
• B. CH4 at 300 K
• C. N2 at 1,027oC
• D. O2 at 0oC

Explanation: For gas molecules at comparable conditions, average speed is proportional to the square root of T/M, where T is in kelvin and M is molar…

• A. Double
• B. Same
• C. Half
• D. Four times

Explanation: The average kinetic energy of gas molecules is directly proportional to absolute temperature.

• A. Diffusion
• B. Effusion
• C. Attraction with air
• D. Low dsensity

Explanation: Fragrance molecules move randomly from the region of high concentration near the source into regions of lower concentration, causing…

• A. Gas
• B. Liquid
• C. Solid
• D. Plasma

Explanation: In the usual elementary classification of matter on Earth, solids are considered the most abundant form because most of Earth's mass is…

• A. Three
• B. Four
• C. Five
• D. Two

Explanation: At the basic chemistry level, matter is commonly classified into four states: solid, liquid, gas and plasma.

• A. H2S
• B. NO
• C. Cl2
• D. N2O

Explanation: Graham's law states that diffusion rate is inversely proportional to the square root of molar mass.

• A. Daltons law
• B. Avogadros law
• C. Grahams law
• D. Charles law

Explanation: Graham's law explains both diffusion and effusion by relating rate to molar mass: rate is proportional to 1 divided by the square root of…

• A. 16 gmol-1
• B. 32 gmol-1
• C. 48 gmol-1
• D. 64 gmol-1Mathematics

Explanation: Using Graham's law, rate of H2 divided by rate of unknown gas equals the square root of molar mass of the unknown divided by 2 g mol-1.

• A. Boltzman
• B. Maxell
• C. Clausius
• D. Bernoulli

Explanation: Daniel Bernoulli proposed the early kinetic theory of gases in 1738, explaining gas pressure through collisions of moving particles with…

• A. Translational motion
• B. Vibrational motion
• C. Rotational motion
• D. All of above motions

Explanation: Particles in a solid are held in fixed positions by strong forces and mainly vibrate about those positions.