First slide

Hardness of water

Question

Permanent hardness of water arises due to the presence of

Easy

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

Solution

The permanent hardness of water is due to the presence of soluble salts CaCl₂ & MgCl₂ , CaSO₄ & MgSO₄
i.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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