Permanent hardness of water can be removed by

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Question:
Permanent hardness of water can be removed by

1.adding alum

2.adding chlorine

3.boiling

4. lime soda process

Posted Date:-2022-09-22 03:26:33

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  1. A circular sewer section is preferred to because
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  4. A pipe sunk into the well to tap underground water is called
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  18. For trunk and out fall, the type of sewers generally used is
  19. Ground water is usually free from
  20. In a dam project geological investigations are to get information about
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