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| Q. |
The process of removing calcium and magnesium from hard water is known as – |
| A. | Sedimentation |
| B. | Filtration |
| C. | Flocculation |
| D. | Water softening |
| Answer» D. Water softening | |
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Explanation: Water softening is the reduction of the concentration of calcium, magnesium, and certain other metal cations in hard water. Hardness ions dissolved in water can cause a variety of undesired effects including interfering with the action of soaps, the buildup oflimescale, which can foul plumbing, and galvanic corrosion. Conventional water-softening appliances intended for household use depend on an ion-exchange resin in which hardness ions are exchanged for sodium ions. |
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