Permanent hardness of water arises due to the presence of
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a
Chlorides and Sulphates of Ca and Mg
b
Carborates of Ca and Mg
c
Bicarbonates of Ca and Mg
d
Phosphates of Ca and Mg
answer is A.
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Detailed Solution
The permanent hardness of water is due to the presence of soluble salts CaCl2 & MgCl2 , CaSO4 & MgSO4i.e., Chlorides, Sulphates of Ca & Mg→ Bicarbonates of Ca & Mg causes temporary hardness for water→ CaCO3 & MgCO3 are soluble salts, which donot causes hardness to water.