First slide

Hardness of water

Question

Which of the following is not a hard water ?

Moderate

A

Water containing CaCl₂
B

Water containing dil. HCl
C

Water containing MgSO₄
D

None of these

Solution

Water containing ${Ca}^{+ 2}, {Mg}^{+ 2} and H^{+} (> 10^{- 7} m)$ is a hard water.

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