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.
Types of water pollution. There are many types of water pollution because water comes from many sources. Here are a few types of water pollution: 1. Nutrients Pollution. Some wastewater, fertilizers and sewage contain high levels of nutrients.If they end up in water bodies, they encourage algae and weed growth in the water.here are many types of water pollution because water comes from many sources. Here are a few types of water pollution: 1. Nutrients Pollution. Some wastewater, fertilizers and sewage contain high levels of nutrients.