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 4 of 23
- 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…
Correct answer: Bernoulli- 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.
Correct answer: Vibrational motion- A. Unchanged
- B. Slightly decreased
- C. Slightly increased
- D. Zero
Explanation: According to the classical kinetic theory, gas diffusion depends on random molecular motion, and the average kinetic energy is…
Correct answer: Zero- A. Ne
- B. N2
- C. NH3
- D. CO
Explanation: At the same temperature and pressure, gas density is proportional to molar mass.
Correct answer: NH3- A. CO is 1.25 times faster than CO2
- B. CO is 3.75 times faster than CO2
- C. CO is 1.25 times faster than CO
- D. Both diffuse at the same rate
Explanation: By Graham's law, rate of effusion is inversely proportional to the square root of molar mass: rate of CO/rate of CO2 = square root of 44…
Correct answer: CO is 1.25 times faster than CO2- A. Fluorescent bulb
- B. Neon signs
- C. Lasers
- D. All of these
Explanation: Plasma is an ionised gas containing free electrons and positive ions, and it conducts electricity and emits light.
Correct answer: All of these- A. Average kinetic energy of molecules
- B. Vibrational kinetic energy
- C. Translational kinetic energy
- D. None of the above
Explanation: In a solid, particles cannot move freely from place to place; they vibrate about fixed positions.
Correct answer: Vibrational kinetic energy- A. 20cm3/min
- B. 40cm3/min
- C. 160cm3/min
- D. 2.5cm3/min
Explanation: Graham's law gives rate1/rate2 = √(M2/M1). Therefore, rate of hydrogen = 10 cm3/min x √(32/2) = 10 cm3/min x 4 = 40 cm3/min.
Correct answer: 40cm3/min- A. Low Temp & High Pressure
- B. High Temp & Low Pressure
- C. High Temp & High pressure
- D. Low Temp & Low Pressure
Explanation: Real gases approach ideal behaviour at high temperature and low pressure because attractive forces and molecular volume become relatively…
Correct answer: High Temp & Low Pressure- A. Water pollution
- B. Sound pollution
- C. Soil pollution
- D. Air pollution Green Living & Environmental Issues
Explanation: A cyclone collector removes particulate matter from a moving gas stream by centrifugal action, forcing dust particles toward the collector…
Correct answer: Air pollution Green Living & Environmental Issues- A. Source
- B. Receptor
- C. Sink
- D. All of them
Explanation: A sink is an environmental medium or reservoir that absorbs and stores pollutants, especially persistent pollutants that remain for long…
Correct answer: Sink- A. Hydrogen tank
- B. Nitrogen tank
- C. Oxygen tank
- D. None of these
Explanation: Traffic police working in polluted, congested areas may use oxygen supplied from an oxygen tank to reduce the effects of inhaling air…
Correct answer: Oxygen tank- A. Compound
- B. Element
- C. Electrolyte
- D. Mixture
Explanation: Air is a mixture because it contains several gases, mainly nitrogen and oxygen, that are not chemically bonded in a fixed ratio.
Correct answer: Mixture- A. Cu Tubing used
- B. Steel tubes used
- C. Both a & b
- D. Material does not effect by refrigerant
Explanation: Ammonia attacks copper and copper alloys, so copper tubing is unsuitable in an ammonia refrigeration system.
Correct answer: Steel tubes used- A. CFCs
- B. CH3COOH
- C. BOTH A & B
- D. None Of These
Explanation: CFCs release chlorine radicals in the stratosphere, and these radicals catalytically destroy ozone molecules.
Correct answer: CFCs- A. 2 moles of gas
- B. 1 mole of gas
- C. 5 moles of gas
- D. 3moles of gas
Explanation: In the van der Waals treatment, the effective volume correction is commonly expressed for 1 mole of gas, with the constant b representing…
Correct answer: 1 mole of gas- A. Greenhouse effect
- B. Fire in coal mines
- C. Dry farming
- D. Monsoon
Explanation: The greenhouse effect occurs when gases such as carbon dioxide, methane and water vapour absorb outgoing infrared radiation and warm the…
Correct answer: Greenhouse effect- A. Dalton's law
- B. Gay Lussac's law
- C. Henry's law
- D. Raoult's law
Explanation: Henry's law states that, at constant temperature, the amount or concentration of a gas dissolved in a liquid is proportional to the gas's…
Correct answer: Henry's law- A. H2
- B. CH4
- C. He
- D. NH3
Explanation: Helium behaves most ideally because its atoms are very small and have extremely weak intermolecular attractions, so deviations from the…
Correct answer: He- A. H+
- B. H-
- C. Cl-
- D. All are stable
Explanation: Cl- is stable in aqueous solution because it is the conjugate base of a strong acid and is surrounded by hydrated water molecules without…
Correct answer: Cl-