Commonly used coagulant used for the purification of water is:
Correct answer: C. Al2(SO4)3
- A. Ca(NO3)2
- B. MgCl2
- C. Al2(SO4)3
- D. Ca(OH)2
Explanation
In water treatment, coagulants like Al2(SO4)3 (aluminum sulfate) are used to remove impurities by causing them to aggregate for easier removal. This process is essential for removing organic matter, pathogens, and toxic materials. Ca(NO3)2 is a fertilizer, MgCl2 is used for de-icing, and Ca(OH)2 is used for pH adjustment, not as a primary coagulant.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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Water pollution covers biological, chemical and physical contaminants, including pathogens, toxic metals, detergents and excess nutrients. Treatment involves screening, sedimentation, coagulation, filtration, disinfection and wastewater processing, while biochemical oxygen demand, chemical oxygen demand, eutrophication and dissolved oxygen indicate pollution levels.
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