If you add the valences of each atom in the molecular formula for arsenious acid, H 3 AsO 3, you can see that the molecule, which is uncharged, has a total valence state of 0 (3x(+1) for the hydrogen atoms; 1x(+3) for the arsenic(III) atom; 3x(-2) for the oxygen atoms = 3+3-6 = 0).
Eighty percent of sewage in India is untreated and flows directly into the nation's rivers, polluting the main sources of drinking water, a study by an environment watchdog showed Tuesday.
Water pollution in the United States and Canada is caused by a. acid rain. c. industrial wastes. b. runoff from agricultural chemicals. d. all of the above. Water pollution in the United States and Canada is caused by all of the above, acid rain, industrial wastes and runoff from agricultural chemicals.