Which one of the following gives the measure of Organic pollution in water?
Correct answer: A. COD
- A. COD
- B. DO
- C. PH
- D. Salinity
Explanation
COD measures the amount of oxygen needed to chemically oxidize organic matter in water, so a high COD indicates greater organic pollution. DO measures oxygen already dissolved in water, while pH and salinity measure different properties. The likely wrong choice is DO because polluted water often has low DO, but DO is an indirect indicator rather than the direct oxygen-demand measure listed here.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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