Which of the following processes can remove both temporary as well as permanent hardness of water ?
Correct answer: D. Distillation
- A. Filtration
- B. Boiling
- C. None of these
- D. Distillation
Explanation
Distillation removes both dissolved bicarbonates responsible for temporary hardness and soluble sulphates or chlorides responsible for permanent hardness. Filtration cannot remove dissolved salts, while boiling removes mainly temporary hardness.
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