Define chemical oxygen demand (COD). from Chemistry Environmen
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    Environmental Chemistry

    Multiple Choice QuestionsShort Answer Type

    11.

    Give one harmful effect of classical smog. 

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    12.

    What is PAN?

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    13. Name the components of photochemical smog which cause irritation of eyes.
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    14.

    What is the nature of London smog and photochemical smog?

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    15.

    Which acids are present in the acid rain?

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    16.

    What is marine pollution?

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    17.

    Define chemical oxygen demand (COD).

    The amount of oxygen (in mgL–1) consumed for oxidising all organic and oxidizable inorganic materials in a sample of water is called COD. COD is always higher than BOD.
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    18.

    Why is COD preferred over BOD?

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    19.

    Which main compounds are causing damage to ozone layer?

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    20. Which disease will be caused due to hole in the ozone layer and why?
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