Which of the following is not responsible for causing permanent hardness of water ?
Correct answer: A. Ca(HCO3)2
- A. Ca(HCO3)2
- B. CaCl2
- C. MgCl2
- D. None of these
Explanation
Calcium bicarbonate causes temporary hardness because it decomposes on heating, whereas calcium chloride and magnesium chloride remain soluble and cause permanent hardness. Therefore, Ca(HCO3)2 is the exception.
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