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By aeration process, dissolved iron is oxidized into ____________

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By aeration process, dissolved iron is oxidized into ____________

(a) Ferrous oxide

(b) Ferric oxide

(c) Ferrous hydroxide

(d) Ferric hydroxide

The question was posed to me in an interview.

This key question is from Removal of Iron, Manganese, Colour, Odour and Taste topic in chapter Miscellaneous Treatment Methods of Environmental Engineering

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The correct option is (b) Ferric oxide

The explanation is: By aeration process, dissolved iron is oxidized into ferric oxide, which is insoluble in water.

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