Which one among the following salts
causes hardness to the water?
(a) Calcium bicarbonate
(b) Calcium carbonate
(c) Sodium sulphate
(d) Potassium chloride

• Presence of calcium and magnesium salts in the form of hydrogencarbonate (also known as bi-carbonate), chloride and sulphate in water makes water ‘hard’.
  
  Option a)Calcium bicarbonate
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