Q. The color of the natural zeolite is ____________

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Q. The chemical formula of Permutit is ____________

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Q. Permutit has an exchange value of ________ grams of hardness per m³ of zeolite.

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Q. The thickness of the layers of filter sand of zeolite softener is ____________

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Q. Which of the following is a disadvantage of the zeolite process?

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Q. The zeolite process is unsuitable for water containing iron and manganese.

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Q. Iron and Manganese are generally present in water supplies as ____________

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Q. What concentration of iron and manganese will cause unpleasant taste and odor of water?

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Q. The presence of Sulfate iron in the water results in ____________

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Q. The reddish tinge in the water is due to the presence of ____________

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

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Q. By aeration process, dissolved iron is oxidized into ____________

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Q. By which process dissolved manganese compounds can be converted into insoluble manganese compounds?

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Q. For removal of iron from water ________ mg of oxygen is required.

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

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Q. Removal of manganese from water takes place at a pH of ______

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Q. When small amounts of iron and manganese are present in water, they are removed by ____________

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Q. Removal of iron from water takes place at a pH of ______

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Q. The taste produced by a microorganism, can be controlled by ____________

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Q. Which of the following regarding ozonation is incorrect?

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