Question

Which of the following statements is true about SMOG? ​

Answer 1

Answer:

All the above statement are true. photochemical smog is composed of two types of pollutants.

Answer 2

d) SMOG is derived from both fog and smoke.

Explanation:

• We know that smoke contains tiny particles of unburned carbon. Smoke is a colloidal solution of solid particles like carbon, dust which are dispersed in air.
• Smoke is a main source of air pollution. The particles of smoke are injurious to health. Thus, the particles of smoke need to be precipitated.  
• Fog is formed when water vapours condense to form liquid water droplets that hang in air. Fog consists of very tiny droplets of water that are dispersed in air.
• When smoke and fog combine together smog is produced.
• Smog could be seen if there is no wind flowing in the area. The main sources of smog are automobile exhausts, power plants that burn coal, burning of fossil fuels, etc.
• Thus, smoke + fog is called smog.