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Pollutants and Their Sources and Their Effects

Peroxyacyl ni...

Question

Peroxyacyl nitrates (PAN) are formed through photochemical reactions between

A

Sulphur oxides and Hydrocarbons

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B

Nitrogen oxides and Hydrocarbons

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C

Nitrogen oxides and

O_{3}

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D

C F C l_{3}

and

O_{3}

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Solution

The correct option is B Nitrogen oxides and Hydrocarbons
Peroxyacyl nitrate (PAN) is produced due to a reaction between ${N O}_{x}$ and hydrocarbons under the effect of UV-radiation of sunlight.

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Q. Assertion :Photochemical smog is mainly composed of nitrogen oxides, volatile organic compounds, ozone and peroxyacyl nitrates. Reason: Photochemical smog develops in cold weather conditions by the interaction of secondary pollutants.

Q. Read the following statements regarding the PAN (peroxyacyl nitrates) and select the correct ones.
(i) It is a secondary pollutant present in photochemical smog.
(ii) It is produced by photochemical reactions between hydrocarbons and nitrogen oxides in the presence of sunlight of UV radiations.
(iii) It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas.
(iv) It is a lachrymatory substance, causing irritation of eyes.

Q. 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.

Q. On heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are:

S O_{2}

C O

O_{3}

N O

and peroxyacetyl nitrate (PAN), the primary and secondary pollutants are:

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