A) chlorides and sulphates of\[Mg\]and\[Ca\]
B) bicarbonates of\[Mg\]and\[Ca\]
C) sulphates of\[Cu\]and\[Hg\]
D) carbonates and bicarbonates of\[Mg\]and\[Sr\]
Correct Answer: A
Solution :
Permanent hardness of water is due to the presence of soluble chlorides and sulphates of calcium and magnesium ie,\[CaC{{l}_{2}}\],\[CaS{{O}_{4}}\],\[MgC{{l}_{2}}\]and\[MgS{{O}_{4}}\].
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