Which salt does not cause hardness in water?

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Question

(D) Hardness in water is caused by the presence of soluble salts of calcium and magnesium,such as bicarbonates,chlorides,and sulfates. $Mg(HCO_3)_2$,$

Vedclass · Accepted Answer

$MgCO_3$

Vedclass · Answer

(D) Hardness in water is caused by the presence of soluble salts of calcium and magnesium,such as bicarbonates,chlorides,and sulfates. $Mg(HCO_3)_2$,$CaCl_2$,and $MgSO_4$ are all soluble in water and contribute to its hardness. $MgCO_3$ (magnesium carbonate) is practically insoluble in water. Since it does not dissolve in water,it does not contribute to the hardness of water.

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