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Read the following statements regarding the PAN (peroxyacyl nitrates) and select the correct ones
1) It is a secondary pollutant present in photochemical smog
2) It is produced by photochemical reaction b/w hydrocarbons and nitrogen oxides in the presence of sunlight or UV lights
3) It is thermally unstable and decomposes into peroxythanoyl radicals and nitrogen dioxide gas
4) It is a lachrymatory substance , causing irritation of eyes
1 and 2
3 and 4
1, 2 and 3
1 ,2 , 3 and 4
Answers (1)
As we have already discussed in Description of Air Pollutants from Man made Sources -
Air Pollutants -
The common air pollutants are : Dust, Smoke, Carbon monoxide (CO), Ammonia (NH3), Sulphur dioxide (SO2), Hydrogen sulphide (H2S), Nitrogen dioxide (NO2), Hydrogen cyanide, Hydrogen fluorides, Chlorines, Phosgenes, Arsines, Aldehydes, Ozone, Ionising and radiations.
- wherein
CO2 is not a normal air pollutant. There is 0.03% CO2 in the air its higher percentage is the cause of green house effect.
Hence, the correct option is (d).
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