| Consider the following statements. |
| 1. Hardness of water is indicated by lack of foam formation by soap. |
| 2. Temporary hardness is due to bicarbonates of magnesium and calcium. |
| 3. Permanent hardness of water is due to sulphate and chloride of calcium and magnesium. |
| 4. Permanent hardness can be removed by boiling. |
| Which of the statements given above are correct? |
A) 3 and 4
B) 1, 2 and 3
C) 2 and 3
D) All of these
Correct Answer: B
Solution :
[b] Hardness of water is indicated by lack of foam formation when soap is added to water. Temporary hardness is presence of bicarbonate ions of calcium and magnesium removed by boiling the water or by adding lime hydroxide). Permanent hardness is due to presence of sulphate chloride of calcium and magnesium. It cannot be removed by boiling as it requires precipitation or ion exchange column method.
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