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| Q. |
The metallic Constituents of hard water are – |
| A. | Magnesium, calcium and tin |
| B. | Iron, tin and calcium |
| C. | Calcium, magnesium and iron |
| D. | Magnesium, tin and iron |
| Answer» C. Calcium, magnesium and iron | |
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Explanation: Hard water is water that has high mineral content. In domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects. |
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