Question : Which of the following metal salts is responsible for permanent hardness in water?
Option 1: KCl
Option 2: Nacl
Option 3: Ca(HCO3)2
Option 4: CaCl2
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Correct Answer: Ca(HCO 3 ) 2
Solution : The correct option is Ca(HCO 3 ) 2.
The presence of bicarbonates of calcium and magnesium causes water to become temporarily hard, but the presence of soluble chlorides and sulphates of calcium and magnesium causes permanent hardness. Calcium bicarbonate, also called calcium hydrogen carbonate, has the chemical formula Ca(HCO 3 ) 2 .
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