Question

Why does river contains lot of impurties?

Answer 1

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Impurities are also introduced in water when it comes in contact with sewage or industrial waste. River water contains dissolved minerals like chlorides, sulphates, bicarbonates of sodium, magnesium, calcium and iron. It also contains suspended impurities of sand, rocks and organic matter.

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Answer 2

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In general, the greater the contact that water has with the soil, or the more soluble the minerals of the soils with which it has come in contact, the greater is the amount of dissolved impurities in river water.