Multiple choice

Permanent hardness of water can be removed by using

  1. Nitrates

  2. Sulphnates

  3. Zeolites

  4. None of the above

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Zeolites (aluminum silicates) are used to remove permanent hardness of water through ion exchange. They effectively remove calcium and magnesium ions that cause hardness. Nitrates and sulfates are additives, not removers, and zeolite treatment is a proven method.