H2O  is hard if it contains

H2O  is hard if it contains

  1. A

    NaHCO3

  2. B

    MgSO4

  3. C

    KCl

  4. D

    NaCl

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    Solution:

    The hardness of water is generally caused by  the  presence of bicarbonates. chlorides and sulphates calcium and magnesium. 

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