Some substances when dissolved in water cause hardness of water.
a) Which of the following substances cause hardness of water? Sodium chloride, calcium bicarbonate, calcium sulphate, magnesium sulphate, calcium chloride, magnesium carbonate.
b) The hardness due to which of the above salts cannot be removed by boiling?

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Solution

a) Calcium bicarbonate, calcium sulphate, calcium chloride.
b) The hardness of water containing the chlorides and sulphates of calcium and magnesium can not be removed by boiling.

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