Question

For removal of manganese from water ________  mg of oxygen is required.

(a) 0.14

(b) 0.50

(c) 0.29

(d) 0.90

This question was posed to me in homework.

The doubt is from Removal of Iron, Manganese, Colour, Odour and Taste in section Miscellaneous Treatment Methods of Environmental Engineering

Answer 1

Correct choice is (c) 0.29

Best explanation: The reaction for removal of manganese from water is – 4Mn + 3O2 + 6H2O = 6MnO2 + 12H

1mg of Mn requires 0.29 mg of O2.