Iron & manganese present in the polluted water is removed by __________________?
Correct answer: D. Oxidation followed by settling & filtration
- A. Simple filtration
- B. Chlorination only
- C. Chemical coagulation
- D. Oxidation followed by settling & filtration
Explanation
Dissolved iron and manganese are first oxidised into insoluble hydroxides or oxides, which are then removed by settling and filtration. Simple filtration cannot efficiently remove the dissolved forms.
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