Moderate
Iron & manganese present in the polluted water is removed by __________________?
Correct answer: B. Oxidation followed by settling & filtration
- A. Simple filtration
- B. Oxidation followed by settling & filtration
- C. Chemical coagulation
- D. Chlorination only
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.
Written and checked by Zahid Hussain, MS Computer ScienceLast updated
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