Which of the following substances cause permanent hardness of water?
A
CaCl2
B
Ca(HCO3)2
C
CaCO3
D
All of the above
Medium
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Updated on : 2022-09-05
Solution
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Correct option is A)
Permanent hardness is caused by dissolved chloride, sulfate, and nitrates of Calcium & magnesium (which are not removed by boiling) and temporary hardness is caused by dissolved calcium hydrogen carbonate (which is removed by boiling).