|Class 10 Biology Management of Natural Resources||Coal and petroleum|
Fossil fuels, coal and petroleum are important source of energy.
Coal and petroleum were formed from the degradation of biomass millions of years ago.
Contains carbon, hydrogen, oxygen and sulphur.
When coal and petroleum are burnt, the products are carbon di oxide, oxides of nitrogen, oxides of sulphur.
Fig. burning of coal
When combustion takes place in sufficient air the carbon monoxide is formed instead of carbon dioxide.
Oxides of sulphur, nitrogen and carbon monoxide are poisonous at high concentration.
Fig. Release of various gases
Carbon dioxide is a greenhouse gas.
Coal and petroleum contains large amount of carbon, if all this carbon is converted to carbon dioxide it can cause intense global warming and so the natural resources should be used judiciously.