In water treatment, alum [Al2(SO4)3] is used for the process of __________________?

Related Mcqs:

Which of the following is not a natural source of air pollution ?

A. Volcanic eruptions and lightening discharges B. Biological decay of vegetable matter C. Photochemical oxidation of organic matter D. None of these...

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?

A. Coagulation and flocculation of colloids B. Oxidation of carbonaceous matter to CO2 C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate D. All A., B. and C....

Which of the following is not a source of ozone emission in the atmosphere?

A. Refrigerators B. Xerox machines C. Dermatological photo-therapy equipments D. High voltage electrical equipments...

Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?

A. 25 B. 50 C. 80 D. 120...

Tolerable limit of nitrogen oxides in air is _____________ ppm?

A. 0.1 B. 1 C. 5 D. 25...