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This set of MCQs helps students to learn about miscellaneous treatment methods which describes several miscellaneous treatments that can be used to improve the hardness, pH, color, taste, odor and cloudiness of water.
What concentration of iron and manganese will cause unpleasant taste and odor of water?
By which process dissolved manganese compounds can be converted into insoluble manganese compounds?
For removal of iron from water ________ mg of oxygen is required.
For removal of manganese from water ________ mg of oxygen is required.
Which of the following regarding ozonation is incorrect?
Iron and Manganese are generally present in water supplies as ____________.
Suspension
Solution
Colloidal particles
Either suspension or solution
The presence of Sulfate iron in the water results in ____________.
Odorless water
Acidity in water
Colorless water
Growth of crenothrix in water mains
The reddish tinge in the water is due to the presence of ____________.
Zinc
Copper
Iron
Manganese
The brown tinge in the water is due to the presence of ____________.
Zinc
Copper
Iron
Manganese
By aeration process, dissolved iron is oxidized into ____________.
Ferrous oxide
Ferric oxide
Ferrous hydroxide
Ferric hydroxide
Removal of manganese from water takes place at a pH of ______.
1.5
3
6
9.4
When small amounts of iron and manganese are present in water, they are removed by ____________.
Aeration
Coagulation
Manganese zeolite
Filtration
Removal of iron from water takes place at a pH of ______.
1.5
3
8.2
9.4
The taste produced by a microorganism, can be controlled by ____________.
Potassium per-manganate
Potassium dichromate
Sodium chloride
Iodine
