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What do you mean by Biochemical Oxygen D...

What do you mean by Biochemical Oxygen Demand (BOD)?

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Biochemical oxygen demand is the amount of oxygen required by bacteria to decompose organic matter in a certain volume of sample of water. Clean water would have a BOD value of less than 5 ppm. Whereas highly polluted water has a BOD value of 17 ppm or more.
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NCERT-ENVIRONMENTAL CHEMISTRY-EXERCISE
  1. Define environmental chemistry.

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  2. Explain tropospheric pollution in 100 words.

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  3. Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?

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  4. List gases which are responsible for greenhouse effect.

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  5. Statues and monuments in India are affected by acid rain. How?

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  6. What is smog? How is classical smog different from photochemical smogs...

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  7. Write down the reactions involved during the formation of photochemica...

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  8. What are the harmful effects of photochemical smog and how can they be...

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  9. What are the reactions involved for ozone layer depletion in the strat...

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  10. What do you mean by ozone hole? What are its consequences?

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  11. What are the major causes of water pollution? Explain.

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  12. Have you ever observed any water pollution in your area? What measures...

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  13. What do you mean by Biochemical Oxygen Demand (BOD)?

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  14. Do you observe any soil pollution in your neighbourhood? What efforts ...

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  15. What are pesticides and herbicides? Explain giving examples.

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  16. What do you mean by green chemistry? How will it help decrease environ...

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  17. What would have happened if the greenhouse gases were totally missing ...

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  18. A large number of fish are suddenly found floating dead on a lake. The...

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  19. How can domestic waste be used as manure?

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  20. For your agricultural field or garden you have developed a compost pro...

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