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Photochemical Smog

Which of the ...

Question

Which of the following statements (s) is not correct?

A

Suspended particulate matter is an important pollutant released by diesel vehicles

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B

Soot particles (size

< 5 μ

) cause fibrosis of the lung living

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C

H_{2} S O_{4}

particulates have size of

500 - 1000 n m

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D

Photochemical smog is formed by oxides of sulphur smoke and dust particles

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Solution

The correct option is C Photochemical smog is formed by oxides of sulphur smoke and dust particles
When climate is warm, dry and sunny, the oxides of nitrogen and unsaturated hydrocarbons are converted in the components such as PAN, formaldehyde which form photochemical smog, by the action of sunlight.

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Similar questions

Q. Assertion : Suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason : Catalytic converters greatly reduce pollution caused by automobiles.

Q. Read the following statements regarding particulate matter and select the incorrect ones.
(i) Particulate matter (PM) consists of soot, fly ash, dust, spores, pollen grains, etc.
(ii) Particulate matter is differentiated into settle able (larger than

10

remaining in air for more than one day to several weeks) particulate matter.
(iii) SPM (suspended particulate matter) consists of aerosol, dust and mist.
(iv) Particulate matter causes respiratory diseases such as tuberculosis, allergy and many more diseases in animals and plants.
(v) According to Central Pollution Control Board (CPCB), particulate size of

2.5

or less in diameter are responsible for causing the greatest harm to human health.

Q. With regard to the assertion and reason, choose the correct option:
Assertion [A]: Suspended particulate matter (SPM) is a major pollutant released by diesel vehicles.
Reason [R]: Catalytic converters greatly reduce pollution caused by automobiles.

Presence of particulate matter in polluted air catalyses the oxidation of sulphur dioxide to:

Q. Assertion: Particles in air which have a size of 2.5 micrometres or less are harmful for the human body.
Reason: Very fine particulate pollutants reach the lungs with inhaled air.

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Photochemical Smog

Standard XII Chemistry

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