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The BOD values of four samples of water ...

The BOD values of four samples of water A,B,C and D are 165 ppm. 120ppm, 20ppm and 5ppm respectively . The most polluted and least polluted water sample are

A

A&B

B

B&C

C

C&D

D

A&D

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-ENVIRONMENTAL CHEMISTRY-LEVEL - I (EXERCISE-II) (Terms & segments , Air pollution , Water pollution , Soil Pollution Control of environmental pollution , Green Chemistry)
  1. A sample of pond water containing 20mg of organic matter requires 16 m...

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  2. Which of the following statements is false?

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  3. A,B,C and D are four 100-mlL samples of water. Fluoride ion concentrat...

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  4. Some statements regarding air pollution are given. Among them, the cor...

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  5. 10^(-3) gm equivalents of K(2) Cr(2) O(7) in 50% H(2) SO(4) is needed...

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  6. Green house gases radiate back the following radiations to the earth s...

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  7. (A): Photo chemical smog is Oxidising in nature (R): Photo chemical...

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  8. In the treatment of domestic sewage water, the weight of oxygen that c...

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  9. Which of the following is not the effect of acid rain

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  10. The BOD values of four samples of water A,B,C and D are 165 ppm. 120pp...

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  11. When rain is accompanied by a thunderstorm, the collected rain water w...

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  12. Which of the following reaction causes depletion of ozone layer in sum...

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  13. A sample of pond water contains 40mg of organic matter requires 32mg o...

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  14. Nerve toxins are

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  15. Which is incorrectly matched?

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  16. Modes of controlling pollution in large cities include

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  17. TLV values of four pollutants A,B,C and D are 2ppm, 9 ppm, 20 ppm and ...

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  18. 100 ml of sample of water requires 3.92 mg of K2 Cr2O3 in presence of ...

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  19. COD of a water sample is 8ppm the weight of acidified K(2)Cr(2) O(7) r...

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  20. Proper management of disposal of household and industrial wastes can b...

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