The presence of calcium and magnesium bi-carbonates in water causes hardness in the water.

Related MCQs

• The temporary hardness due to calcium bicarbonates can be removed by
• The presence of calcium and magnesium chloride in water causes
• Calcium sulphate present in water causes corrosion.
• The presence of hydrogen sulphide in water causes
• The presence of bacteria in water causes
• The presence of carbon dioxide in water causes acidity.
• The temporary hardness in water is cused due to the salts like
• When manganese is present in water, it reduces the degree of hardness.
• The maximum permissible hardness in water for drinking purposes should not exceed 100 ppm.
• By base exchange method, water of zero degree hardness can be obtained.