Chemical Composition of Air: Composition of Atmosphere and Photochemical Smog

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Composition of Atmosphere

Composition of Atmosphere

Particles, Ions and Radicals in the Atmosphere

Particles, Ions and Radicals

Chemical Processes for Formation of Inorganic Particulate Matter

Chemical Processes for Formation
Inorganic Particulate Matter

Chemical Processes for Formation of Organic Particulate Matter

  • Polycyclic aromatic hydrocarbons (PAH)
  • Benzopyrene
  • Soot particles

Oxygen and Ozone Chemistry

Oxygen and Ozone Chemistry

Photochemical Smog

  • Observed in the localities like Los Angeles and Denver, USA in 1943.
  • Also known as oxidising smog and Los Angeles smog having a high concentration of oxidants.
  • Characterised by brown, hazy fumes which irritates the eyes and lungs and leads to cracking of rubber.
  • Peroxyacyl Nitrate (PAN) is formed in the reaction which is the major eye irritant.

Multiple Choice Questions

  1. 1. Which among the following a trace element in atmosphere?
  2. Neon
  3. Argon
  4. Carbon dioxide
  5. Water vapour

Answer: a

2. Aerosol particle of natural origin with size less than 0.2µ are known as

  1. Mist
  2. Smog
  3. Aitken particle
  4. God Particle

Answer: c

3. Which among the following particulate matter is introduced by anthropogenic activities?

  1. Ba
  2. Pb
  3. Br
  4. All of the above

Answer: d

4. The maximum concentration of ozone is found at

  1. 40 km
  2. 25 km
  3. 15 km
  4. 50 km

Answer: b

5. Photochemical smog is also known as

  1. Reducing smog
  2. London smog
  3. Oxidising smog
  4. Both a and b

Answer: c

#Chemical Composition of Air


#Composition of Air


#Ions And Radicals In The Atmosphere

#Chemical Processes In The Formation of Inorganic and Organic Particulate Matters

#Oxygen And Ozone Chemistry

#Photochemical Smog

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