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Temporary hardness of water is caused due to the presence of bicarbonates of calcium and magnesium, i.e.,Ca\left (HCO_3 \right )_2,Mg(HCO_3)_2  while the permanent hardness of water is due to the presence of soluble chlorides and sulfates of calcium and magnesium, i.e.,CaCl_2,MgCl_2

Hence the Correct option is (4).

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Pankaj Sanodiya

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