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Water become useless for drinking purpos...

Water become useless for drinking purpose if the fluoride concentration exceeds

A

10 ppm

B

5 ppm

C

3ppm

D

20 ppm

Text Solution

Verified by Experts

The correct Answer is:
C
3 ppm
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AAKASH SERIES-ENVIRONMENTAL CHEMISTRY-PRACTICE SHEET (STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. Water pollution does not cause

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  2. The reagent used to detect fluoride present in water in

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  3. Whch one of the following substances is used to reactivate the de acti...

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  4. Formula of enamel on teeth is

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  5. Water become useless for drinking purpose if the fluoride concentratio...

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  6. In ion exchange method of defluoridation of water, which one of the fo...

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  7. DDT is

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  8. The suspected carcinogeic water pollutant is

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  9. Phosphate pollution is caused by

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  10. By using activated carbon method, F- ion concentration in water can be...

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  11. In the Nalgonda method, chemicals used for defluoridation of water in ...

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  12. Which one of the following can be recycled ?

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  13. CH2=CH2+O(2)overset(" onestepoxidation")underset("metal ions")rarrunde...

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  14. Which of the following is environmental friendly reaction

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  15. Metal that escapes into atmosphere by the fumes of automobile vehicles

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  16. Which of the following is green house gas and also causes depletion of...

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  17. The common components of photo chemical smog are

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  18. Which of the following is not the effect of ozone bole.

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  19. The green house effect is mainly caused by

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  20. Among the following herbicide is

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