The permanent hardness of water can be removed by

Related MCQs

• The permanent hardness in water is caused due to the salts like
• The temporary hardness due to calcium bicarbonates can be removed by
• The presence of calcium and magnesium bi-carbonates in water causes hardness in the water.
• By base exchange method, water of zero degree hardness can be obtained.
• 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 lime soda process, hardness can be reduced to less than
• The finely divided dispersion of solid particles which are not visible to the naked eye and cannot be removed by ordinary filters are known as
• In high rate activated sludge treatment, bacterias are removed from