Discussion
Permanent hardness of water can be removed by:
Answer: B
Permanent hardness is removed by soda.
Permanent hardness is caused by calcium and magnesium sulphates and chlorides, which are not removed by boiling. Adding washing soda (sodium carbonate) converts them into insoluble calcium and magnesium carbonates, which settle out, leaving soft water.
Boiling removes only temporary hardness, which is due to bicarbonates. Chlorination kills germs but does not affect hardness, and filtration removes suspended particles, not dissolved salts.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development