a Rate of chemical reactions b circulation c Biological acti

a. Rate of chemical reactions b. circulation c. Biological activity d. all of these 16. Alkalinity is reported as mg/L of a. NaNO b. CaCO c. MgCOs d. NaHCO 17. Spectrophotometry is any technique that uses .to measure chemical concentrations in water b. light c. conductivity d. none of these 18. Beer-Lambert\'s law states that absorbance is proportional to the concentration of the absorbing species: a. True b. False 19. Coliform organisms are not used to determine the biological characteristics of natural waters.: a. True b. False 20. Amount of dichromate consumed in the oxidation of inorganic and organic matter mater is known as: a. BOD c. COD b. TOC d. None of these

Solution

16) Option B is correct. Alkalinity is measured as CaCO3

17)Option B is correct. It uses light to measure chemical concentrations.

18) True. It isstating that linear relationship between absorbance and concentration of an absorbing species is exists.

19) False. It is used to determine the biological characteristics of the natural waters.

20) Optionn c is correct. It is known as COD which is chemical oxygen demand.