Q.

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.
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