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Q.

Hardness of water is due to the presence of

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a

CaCl2

b

MgSO4

c

Ca(HCO3)2

d

All the above

answer is D.

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Detailed Solution

The hardness of water is due to dissolved salts of Magnesium and calcium bicarbonates , chlorides and sulphates. 

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Hardness of water is due to the presence of