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प्रश्न
The pH of normal rain water is ______.
विकल्प
6.5
7.5
5.6
4.6
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उत्तर
The pH of normal rain water is 5.6.
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संबंधित प्रश्न
Haemoglobin of the blood forms carboxy haemoglobin with ______.
Which sequence for green house gases is based on GWP?
Photo chemical smog formed in congested metropolitan cities mainly consists of ______.
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.
Define smog.
Explain how does greenhouse effect cause global warming.
How does classical smog differ from photochemical smog?
How is acid rain formed?
