When manganese is present in water, it reduces the degree of hardness.

Related MCQs

• By base exchange method, water of zero degree hardness can be obtained.
• The maximum permissible quantity of iron and manganese in water for domestic purposes should be
• The presence of calcium and magnesium bi-carbonates in water causes hardness in the water.
• The temporary hardness in water is cused due to the salts like
• The maximum permissible hardness in water for drinking purposes should not exceed 100 ppm.
• The permanent hardness in water is caused due to the salts like
• The permanent hardness of water can be removed by
• The temporary hardness due to calcium bicarbonates can be removed by
• By lime soda process, hardness can be reduced to less than
• Calcium sulphate present in water causes corrosion.