Multiple choice

Permanent hardness of water due to the presence of metal sulphates can be removed by the use of ____.

  1. nitrates

  2. zeolite

  3. sulphonates

  4. none of these

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

Zeolites are aluminosilicate minerals that can exchange sodium ions for calcium and magnesium ions. This ion exchange process effectively removes permanent hardness caused by metal sulfates from water.