Everyday Science
NULL
Medium
Question
Permanent hardness of water can be removed by adding __________?
A
Chlorine
B
Washing soda
✓ Official correct answer
C
Bleaching powder
D
None of these
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
Chlorine
No member explanations yet for this option.
B
Washing soda
No member explanations yet for this option.
C
Bleaching powder
No member explanations yet for this option.
D
None of these
No member explanations yet for this option.
Explanation
Washing soda (Na₂CO₃) softens permanently hard water.
So the correct answer is Washing soda.
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