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Pollution of Air and Water — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8SciencePollution of Air and Water2 Marks
Question
What causes the hardness of impure water?
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Answer

Hardness of impure water is caused by the presence of sulphates, chlorides of calcium and magnesium (Permanent hardness) or hydrogen carbonates of calcium and magnesium (Temporary hardness).

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