Chemical Composition of Air: Composition of Atmosphere and Photochemical Smog

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Composition of Atmosphere

Illustration: Composition of Atmosphere

Particles, Ions and Radicals in the Atmosphere

Illustration: Particles, Ions and Radicals in the Atmosphere

Chemical Processes for Formation of Inorganic Particulate Matter

Illustration: Chemical Processes for Formation of Inorganic Particulate Matter
Illustration: Chemical Processes for Formation of Inorganic Particulate Matter

Chemical Processes for Formation of Organic Particulate Matter

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

Oxygen and Ozone Chemistry

Illustration: 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 0.2ยต 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

#UGC NTA NET

#Composition of Air

#Particles

#Ions And Radicals In The Atmosphere

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

#Oxygen And Ozone Chemistry

#Photochemical Smog

โœ Mayank