The correct set of species responsible for the photochemical smog is: 

 

 

  • Option 1)

    NO,NO_2,O_3\: \: \: \: and\: \: \:hydrocarbons

     

  • Option 2)

    N_2,NO_2,\: \: and\: \: \:hydrocarbons

  • Option 3)

    N_2,O_2,O_3\: \: and\: \: \:hydrocarbons

     

  • Option 4)

    CO_2,NO_2,SO_2\: \: and\: \: \:hydrocarbons

Answers (1)

 

Photochemical smog / oxidising smog -

Occurs in warm, dry and Sunny climate

- wherein

Mixture of formaldehyde, acrolein, nitric oxide, ozone, and proxy-acyl nitrates (PAN)

 

 

 

Photochemical smog formation -

Emission of nitrogen oxides and hydrocarbons from automobiles exhausts and solar energy by chain of reactions. NO3 and O3 react with unburnt hydrocarbons to produce formaldehyde, aerolein and proxy-acyl nitrates (PAN)

- wherein

NO_{2}(g)\rightarrow NO\left ( g \right )+O\left ( g \right )

O\left ( g \right )+O_{2}\rightleftharpoons O_{3}(g)

NO(g)+O_{3}\left ( g \right )\rightarrow NO_{2}\left ( g \right )+O_{2}\left ( g \right )

3CH_{4}+2O_{3}\rightarrow 3CH_{2}= O\,(formaldehyde)+3H_{2}O

CH_{2}= CHCH= O\, (Acrolein)

CH_{3}COONO_{2}

            \parallel

            O  (PAN)

 

 

 

Photochemical smog is a grey or yellowish brown opaque smog having an oxidising environment with a little smoke. Photochemical smog contains secondary pollutants or photochemical oxidants like Nitrogen Oxide, peroxyacetyl nitrates, aldehydes & phenols due to photochemical reactions between nitrogen oxides & unsatured hydrocarbons.

\therefore correct option : 

NO,NO_2,O_3 & hydrocarbons.


Option 1)

NO,NO_2,O_3\: \: \: \: and\: \: \:hydrocarbons

 

Option 2)

N_2,NO_2,\: \: and\: \: \:hydrocarbons

Option 3)

N_2,O_2,O_3\: \: and\: \: \:hydrocarbons

 

Option 4)

CO_2,NO_2,SO_2\: \: and\: \: \:hydrocarbons

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