Free Real and Ideal Gases MCQs with Answers

• A. high temperature and low pressure
• B. low temperature and high pressure
• C. high temperature and high pressure
• D. standard temperature and pressure

Explanation: At high pressure the molecules are close enough that their own volume is no longer negligible, and at low temperature they move slowly…

• A. the volume occupied by the gas molecules
• B. the intermolecular forces of attraction
• C. the number of moles present
• D. the temperature of the gas

Explanation: The term involving a raises the measured pressure to what it would have been without attractions pulling molecules away from the wall, so…

• A. the mass of the container
• B. the finite volume of the molecules and the attractive forces between them
• C. the speed of the molecules
• D. the colour of the gas

Explanation: The constant b subtracts the volume actually occupied by the molecules and the constant a adds back the pressure lost to intermolecular…

• A. boiling point
• B. critical temperature
• C. melting point
• D. triple point

Explanation: Above the critical temperature no amount of pressure will produce a liquid, because the molecules have too much kinetic energy for the…

• A. Helium
• B. Ammonia
• C. Water vapour
• D. Carbon dioxide

Explanation: Helium is a small non polar monatomic gas with very weak dispersion forces and negligible molecular volume, so it comes closest to the…

• A. zero
• B. exactly 1 at all pressures
• C. always greater than 1
• D. always less than 1

Explanation: By definition an ideal gas satisfies PV equal to nRT exactly, so Z is one under every condition.

• 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…

• 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…

• 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…

• 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…

• 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.

• 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.

• 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.

• 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…

• 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…

• 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…

• 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…

• 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…

• A. Aug - Nov
• B. Sep - Nov
• C. Nov - Dec
• D. Dec - Jan

Explanation: The Antarctic ozone hole reaches its greatest seasonal depletion during the Southern Hemisphere spring, especially from September to…

• A. Cl2
• B. O3
• C. ClO2
• D. both B & C

Explanation: Ozone and chlorine dioxide are effective water disinfectants and do not produce the chlorinated organic by-products associated with…