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(A): COD of water is detennined by oxidi...

(A): COD of water is detennined by oxidising the organic matter with acidified (50% `H_2SO_4)` potassium dichromate solution
(R) Greater the COD value of water greater is its pollution

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-ENVIRONMENTAL CHEMISTRY-LEVEL - I (EXERCISE -I) (Definition of terms , Introduction , Environmental segments - Air pollution , Water pollution)
  1. Which of the following does not indicate high level of pollutants or t...

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  2. The study of toxicity of organo metallic compounds is termed as

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  3. (A): COD of water is detennined by oxidising the organic matter with a...

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  4. The TLV values of four pollutants A, B, C and Dare 9ppm, 10ppm, 100ppm...

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  5. The region which is greatly affected by air pollution is

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  6. The region which contains water vapour is

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  7. Solid component of the carth consisting of soil, rocks and mountains i...

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  8. Which of the following is a primary pollutant

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  9. The greatest affinity for haemoglobin is shown by

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  10. The most abundant hydrocarbon pollutant is

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  11. Ozonc layer is present in the region

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  12. In which or the following region ionisation of gases takes place

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  13. Heat balance on earth surface is maintained by circulation of air in

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  14. The extent of conversion of oxyhaemoglobin lo carboxy heaemoglobin dep...

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  15. The level of CO gas in air that causes immediate death is

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  16. The source of CO(2) in the atmosphere is

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  17. Which is incorrect about 'green house effect'

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  18. Global warming can be prevented by

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  19. The set of gases causing green house effect is

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  20. Unimely and unusual rains are due to

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