Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ?
Correct answer: A. Zeolites
- A. Zeolites
- B. Sulphonides
- C. Lime
- D. Nitrates
Explanation
Zeolites remove calcium and magnesium ions by exchanging them for sodium ions, so they can eliminate permanent hardness caused by sulphates and chlorides. Lime is mainly used for certain forms of temporary hardness.
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