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Correct statements of the following are ...

Correct statements of the following are
Fluorides can be detected by zirconium - alizarin S - dye
Harmless level of fluorides in water is upto 10ppm
In Nalgonda technique bleaching powder, lime and alum are added in the same order
Less than 3ppm of fluoride concentration can caui1e fluorosis

A

A and C

B

C and D

C

B and D

D

A and B

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The correct Answer is:
A
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A,B,C and D are four 100-mlL samples of water. Fluoride ion concentrations in these samples are 2, 5, 8 and 12 ppm respectively. One drop of alizarine - S dye is added to each of these samples. The order of intesity of pink colour in these water samples is

AAKASH SERIES-ENVIRONMENTAL CHEMISTRY-LEVEL - I (EXERCISE -I) (Definition of terms , Introduction , Environmental segments - Air pollution , Water pollution)
  1. Water become useless for drinking purpose if the fluoride concentratio...

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

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  3. Disease caused by excess of flourides in water is

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  4. By using activated carbon method, F^(-) ion concentration in water can...

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

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  6. Which of the following is used as "Bioremedies"

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  7. Addition of phosphate fertilizers into water leads to

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  8. Domestic waste mostly constitues

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  9. DDT is

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  10. The suspected carcinogeic water pollutant is

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  11. Phosphate pollution is caused by

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  12. Sewage water is purified by

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  13. Water is often treated with chlorine to

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  14. (A): Instead of using conventional fuels and energy systems, non-conve...

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  15. (A): Research must be carried in such a manner that there will not be ...

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  16. Faecal matter polluting drinking water causes

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  17. Correct statements of the following are Fluorides can be detected b...

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  18. Which of the following is not an air pollutant?

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  19. {:("List-1","List-2"),((A)"Cu Zn from chromium plating industry ",(I)"...

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  20. Biodegradable materials are

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