Which of the following are the parameters for defining water quality 1 ...........

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Which of the following are the parameters for defining water quality?

1. Turbidity

2. Chemical Oxygen Demand

3. Hardness due to presence of Arsenic, Cadmium and Chromium.

Select the correct answer from given below codes:

1 and 2 only

2 and 3 only

3 only

All of the above

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Explanation:

Physical properties of water quality include temperature and turbidity. Chemical characteristics involve parameters such as pH and dissolved oxygen. Biological indicators of water quality include algae and phytoplankton. Dissolved Oxygen (D.O.); Chemical Oxygen Demand (COD); Total dissolved solids, Suspended solid; Chloride; Sulphate; Cyanide; Nitrate + Nitrite Fluoride; Phosphate; Ammonia Total hardness (as CaCO3); Calcium; Magnesium; Arsenic Cadmium; Chromium (VI); Iron (filterable).