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Insoluble ferric oxide is produced in the pH range:

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Suspended particles separate with gelatinous $Al(OH)_{3}$ ppt:

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Commonly used coagulants are ions of:

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Alum or aluminium sulphate used as coaglant in alkaline medium change into precipitate of radicals of aluminium:

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Substance(s) used for disinfecting water is(are):

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Chlorinating agent most commonly used in disinfection of water is now-a-days:

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Pathogens in raw water are killed in step:

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Water is made disinfectant during purification of water in the step:

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Chemicals like $Al_{2}(SO_{4})_3$ or alum are used in purification of water during step:

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Materials suspended in water or present as colloidal form in raw water are removed by:

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Passing of air to remove foul gases, dissolved gasses, organosulfur compounds and volatile organic compounds is done in step:

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Suspended matter is settled in purification of water by:

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Underground or surface water is treated because it is:

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Water is purified for:

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Range of DO is (in ppm):

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COD is termed for:

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BOD is termed for:

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DO abbreviation is used for:

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The amount of potassium dichromate consumed during supply of oxygen to the organic compound dissolved in water is called:

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The capacity of organic matter dissolved in water to consume oxygen with a period of five days is called:

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The amount of oxygen dissolved in water to oxidize organic matter is called:

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Quality of water is measured by the term:

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Chromium VI is highly toxic causing disease of:

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Leather tanneries cause water pollution by converting Cr VI-salts into a chromium with oxidation state:

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Leather tanneries use big quantities of:

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