Answers

2014-06-10T14:54:42+05:30
Oxygen is used by animal and humans for breathing. It helps in burning. Oxygen is also needed by plants for respiration? ?.............,,,,,.....nitrogen-used by plants to grow. Used in drugs. Used to control pollution..........................composition-'--nitrogen...78% ,,,,, oxygen..20.9 % ..,,,argon..0.90%, co2.. 0.3 % , other gases and water vapour.. 0.17%
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2014-06-10T15:06:20+05:30
Air contains different type of gas,water vapour etc.like nitrogen,oxygen,CO2,etc
uses of oxygen
1)used in hospital
2)used in welding purpose (pure oxygen)
uses of nitrogen
1)used in making different nitrogen compounds
2)used in fertilisers

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