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| Q. |
Ion exchange units are known as |
| A. | water hardeners |
| B. | water softeners |
| C. | water purifiers |
| D. | exchangers |
| Answer» B. water softeners | |
| Explanation: ion exchange units that replace calcium and magnesium ions from water are known as water softeners. they may also remove varying amounts of other inorganic pollutants such as metals. | |
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