Question

Which of the following pollutant increases the hardness of water?

• A. Mg
• B. Ca
• C. Fe
• D. All of the above

Answer 1

The correct option is D All of the above

Water has dissolved minerals and the salts. The percentage of salts in the water determines its quality. On the basis of the amount of calcium and magnesium salts it can be classified as hard water and soft water. Hard water contains a high percentage of calcium and magnesium salts. Iron can also contribute to hardness. These elements form scale in piping, water heaters, and dishwashers causing expensive repairs. Hard water increases soap consumption, starches your laundry, leave a scratchy feeling after bathing, leaves hair hard to manage, scales glasses and dishes, and affects taste and tenderness of many cooked foods. Soft water has a low percentage of calcium and magnesium salts.

So, the correct answer is option D.