Ozone absorbs $$U.V.$$ radiations harmful to human life.
114.
Which of the following is/are formed when ozone reacts with the unburnt hydrocarbons in polluted air?
(i) Formaldehyde
(ii) Acrolein
(iii) Peroxyacetyl nitrate
(iv) Formic acid
Dinitrogen and dioxygen do not react with each other at a normal temperature. At high temperature ( in an automobile engine ) when fossil fuel is burnt, these gases combine to yield Significant quantities of $$NO$$ and $$N{O_2}.$$
116.
The statement which is not true
A
$$N{O_2}$$ does not play any role in photochemical smog
B
$$S{O_3}$$ is more harmful air polluntant than $$S{O_2}$$
C
$$S{O_2}$$ dos not affect larynx ( voice box )
D
$$NO$$ is more toxic to living tissues than $$N{O_2}$$
Answer :
$$S{O_3}$$ is more harmful air polluntant than $$S{O_2}$$
118.
Identify the correct statements.
(i) Winter smog is reducing in nature due to presence of particulate carbon and $$S{O_2}.$$
(ii) The pollutant obtained from emission tubes of diesel engines is benzopyrene.
(iii) Photochemical smog is made up of $$PAN,{O_3}$$ and oxides of nitrogen.
(iv) $$CFCs$$ are stable in troposphere and act as pollutants in stratosphere.