Question:
The following methods can not be used to remove permanent hardness of water:
The following methods can not be used to remove permanent hardness of water:
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Permanent hardness is removed using methods like ion-exchange or Calgon, while lime is used for temporary hardness.
Updated On: May 15, 2025
- Treatment with washing soda
- Ion-exchange method
- Treating with Calgon
- Adding calculated amount of lime
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The Correct Option is D
Solution and Explanation
Permanent hardness is due to dissolved calcium and magnesium salts, particularly sulphates and chlorides.
- Washing soda, ion-exchange method, and Calgon are effective in removing this type of hardness.
- Lime treatment is typically used for temporary hardness (due to bicarbonates), not permanent hardness.
- Washing soda, ion-exchange method, and Calgon are effective in removing this type of hardness.
- Lime treatment is typically used for temporary hardness (due to bicarbonates), not permanent hardness.
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