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Photochemical Smog

Photochemical...

Question

Photochemical reaction of nitrogen oxides with unsaturated hydrocarbons produces.

A

Methyl isocyanate

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B

Phosgene

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C

Benzpyrene

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D

Peroxy-acyl nitrates

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Solution

The correct option is D Peroxy-acyl nitrates
Peroxyacyl nitrates are hazardous respiratory and eye irritants present in photochemical smog. They are nitrates produced by the reaction of oxides of nitrogen with unsaturated hydrocarbons such as aldehydes or other compounds present in atmospheric VOC's
Formation of PANs (CH₃COOONO₂)
Hydrocarbons + O₂ + NO₂ + light → CH₃COOONO₂
So, the correct option is 'Peroxy-acyl nitrates'.

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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. Photochemical oxidants such as PAN and PBN are formed :
A. by the action of nitrogen oxides on hydrocarbons in the presence of sunlight.
B. by the action of carbon dioxide on hydrocarbons in the presence of sunlight.
C. by the action of hydrogen sulphide on hydrocarbons in the presence of sunlight.

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. Assertion (A): Aldehydes are one of the constituents of photochemical smog.
Reason (R): Aldehydes are produced by photochemical oxidation of hydrocarbons by ozone.

Q. Assertion : Photochemical smog is produced by nitrogen oxides
Reason: Vehicular polIution is a major source of nitrogen oxides.

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Photochemical Smog

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