CBSE and ISC important topics for 2019||Oxides of Nitrogen Supertricks with Great concepts||Watch It

Описание: CBSE Class 12 Chemistry Notes: The p Block Elements – Nitrogen Family (Oxides)
The elements of group 15 combines with oxygen directly or indirectly to form different types of oxides.
Oxidation state of central atom
+5
+4
+3
+2
+1
Nature of oxides
All the oxides of nitrogen and phosphorus are strongly acidic in nature (except NO and N2O); oxides of arsenic are weakly acidic; oxides of antimony are amphoteric and oxides of bismuth are weakly basic. This can be explained on the basis of increase in size of central atom. In lower element oxides, atom has small size and it can more strongly pulls the electron pair between O-H bond in water and thus helps in release of H+ ions.

Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide (NO) and nitrogen dioxide (NO2). Other gases belonging to this group are nitrogen monoxide (or nitrous oxide, N2O), and nitrogen pentoxide (NO5).

Human Sources of Nitrogen Oxides

At normal temperatures the oxygen and nitrogen gases do not react together. In the presence of very high temperatures nitrogen and oxygen do react together to form nitric oxide. These conditions are found in the combustion of coal and oil at electric power plants, and also during the combustion of gasoline in automobiles. Both of these sources contribute about equally to the formation of nitrogen oxides.
In areas of high automobile traffic, such as in large cities, the amount of nitrogen oxides emitted into the atmosphere can be quite significant. In the Los Angeles area, the main source of acid rain is from automobiles. In certain national parks such as Yosemite and Sequoia, automobile traffic is banned to limit the amount of air pollution damage to the trees and plants. This also has the effect of reducing the visual smog in the air.


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