Gases - Facts to Remember

Fact to rememberName of the gas
Gas most abundant in earth's atmosphereNitrogen (78%)
Percentage of oxygen in earth's atmosphere21% (appx)
The lightest gasHydrogen
The heaviest gasRadon
Tear GasAmmonia (NH3)
Marsh gasMethane
Laughing gas Nitrous Oxide (N2O)
Natural gasMainly methane with small quantities of ethane and propane
Gobar gasMethane, CO2 and hydrogen
Gas with foul smell Hydrogen Sulphide (H2S)
Gas mixed with oxygen and given to patients with restricted breathing Helium
A major air pollutant, the percentage presence of which is checked in vehicle pollution testCarbon monoxide
The gas which is responsible for the formation of brown air in traffic congested citiesNitrogen Dioxide
Major gaseous pollutant of areas located near thermal power stationSuphur dioxide
Strong smelling substance added to LPG Ethyl Mercaptan or Ethanethiol
Gases responsible for depletion of ozone layerChloroflouro carbons
Gas responsible for acid rainSulphur dioxide
Gas used in gas welding and also artificial ripening of fruitsAcetylene
Gas used in electric bulbs Argon
Gas used in flourescent lamps Mercury vapour
Gas used in LPGButane, Propane and Ethane
Gas used in refrigerationFreon (Diflouro Dichloro Methane)
Gas used as an anaesthetic in dental surgeryNitrous Oxide