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| Q. |
The two metal ions that cause hardness to water are: |
| A. | Calcium, Magnesium |
| B. | Sodium, Calcium |
| C. | Sodium, Potassium |
| D. | Sodium, Magnesium |
| Answer» A. Calcium, Magnesium | |
|
Explanation: Calcium and magnesium ion cause hardness of water. |
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