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write it and then send it's not clear
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viii) The possible constituents of sewage are : domestic wastes , commercial wastes and chemical wastes.
ix) Untreated sewage should not be pushed into the rivers as the sewage pollutes the water and makes it unsuitable for consumption and usage .
x) We test the presence of starch using iodine solution. If the solution turns blue-black , it proves that the item contains starch.
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