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The brown tinge in the water is due to the presence of ____________

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The brown tinge in the water is due to the presence of ____________

(a) Zinc

(b) Copper

(c) Iron

(d) Manganese

I have been asked this question in an interview for job.

I need to ask this question from Removal of Iron, Manganese, Colour, Odour and Taste in portion Miscellaneous Treatment Methods of Environmental Engineering

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The correct answer is (d) Manganese

To explain: The brown tinge in the water is due to the presence of manganese, which occurs when it is present in an amount greater than 0.3ppm.

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