Everyday Science
NULL
Medium
Question
Permanent hardness of water is mainly due to __________?
A
Sodium bicarbonate
B
Calcium sulfate
✓ Official correct answer
C
Calcium bicarbonate
D
None of these
Community credibility
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A
Sodium bicarbonate
No member explanations yet for this option.
B
Calcium sulfate
No member explanations yet for this option.
C
Calcium bicarbonate
No member explanations yet for this option.
D
None of these
No member explanations yet for this option.
Explanation
Permanent hardness comes from dissolved salts such as calcium sulfate (not removed by boiling alone).
So the correct answer is Calcium sulfate.
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