Question

classify various river pollutants and the category of solution,suspensions and colloids

Answer 1

The various water pollutants can be classified as follows: 
1. oxygen demanding wastes are biodegradable organic compounds eg sewage , waste from food prcessing plants pper mills and tanneries 
2. disease causing agents bacteria , viruses fromm sewage and food processing plants 
3. synthetic organic compounds like pesticides and industrial chemicals 
4. inorganic chemicals and minerals the metallic compounds of heavy metal like cadmium , chromium , lead murcury and silver , alkalies discharged by industries of textile , tanneries paper etc . 
5.suspended solids like sand , silt and minerals erroded from land 
6.oil and radioactive substances like oil and oil wastes enter from oil refineries and storage tanks , radioactive metals enter from uranium refineries etc 
inorganic impurities forms solutions , the suspended impurities forms suspensions , oil, synthetic organic compounds , plant nutrients etc forms colloids.

Answer 2

River pollutants:
1)Colloids: 
-polystyrene latex
-bacteria
2)suspensions:
-plastic bags
-pieces of papers
-plant materials
-oil
3)solutions
-detergents
-soluble fertilizers such as nitrates 
-heated water from factories