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प्रश्न
How does classical smog differ from photochemical smog?
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उत्तर
- Classical smog:
- Classical smog is caused by coal smoke and fog.
- It occurs in cold humid climate.
- The chemical composition is the mixture of SO2, SO3 gases and humidity.
- Chemically it is reducing in nature because of the high concentration of SO, and so it is also called reducing smog.
- It is primarily responsible for acid rain.
- It also causes bronchial irritation.
- Photochemical smog:
- Photochemical smog is cause by photochemical oxidants.
- It occurs in warm, dry and sunny climate.
- The chemical composition is the mixture of NO2 and O3 gases.
- Chemically it is oxidising in nature because of the high concentration of oxidising agents such as NO2 and O3
- and so it is also called oxidizing smog.
- It causes irritation to eyes, skin and lungs and increases the chances of asthma.
- It causes corrosion of metals, stones
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संबंधित प्रश्न
The pH of normal rain water is ______.
Living in the atmosphere of CO is dangerous because it ______.
Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using ______.
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.
Match the List I with List II and select the correct answer using the code given below the lists.
| List I | List II | ||
| A | Depletion of ozone layer |
1 | CO2 |
| B | Acid rain | 2 | NO |
| C | Photochemical smog | 3 | SO2 |
| D | Green house effect | 4 | CFC |
Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted.
Reason(R): High biological oxygen demand means high activity of bacteria in water.
From where does ozone come in the photo chemical smog?
Explain how does greenhouse effect cause global warming.
Differentiate the following:
BOD and COD
Explain how oxygen deficiency is caused by carbon monoxide in our blood? Give its effect.
