Choose the correct set for international standards for drinking water.
(P) `F^(ϴ) lt 2` ppm , (Q) `Pb lt 50` ppb
(R) `SO_(4)^(2-) le 500` ppm , (S) `NO_(3)^(-) le 50` ppm

Match the following List I A) NO_(3)^(-) ion in drinking water greater than 50 ppm causes B) SO_(4)^(2-) ion greater than 500 ppm causes C) Mercury poison causes D) Domestic sewage causes List-II I) Depletion of dissolved oxygen II) Minimata disease III) Laxative effect IV) Blue baby syndrome The correct match is

Which one are correct about the solution that contains 3.42 "ppm" Al_(2)(SO_(4))_(3) and 1.42 "ppm" Na_(2)SO_(4) ?

The maximum allowable level of Nitrates in drinking water as set by U.S. is 45 mg NO_(3)^(-) ions per dm^(3) , the level in ppm is

Write the follwing sets as intervals. (i) (x:x in R, -3 lt x le 15) (ii) (x:x in R, -2 lt x)

Write the follwing sets as intervals. (i) (x:x in R, -3 lt x le 15) (ii) (x:x in R, -2 lt x)