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

Correct statements of the following are Fluorides can be detected by z

1.	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
Answer» A and C C and D B and D A and B Answer :A