Which of the following statement is false about hardness of water

Which of the following statement is false about hardness of water

  1. A

    Bicarbonates of calcium and magnesium are responsible for temporary hardness of water

  2. B

    Clarke's process is useful to remove permanent hardness of water

  3. C

    Deionized water is obtained when water is passed through both cation exchange resin and anion exchange resin.

  4. D

    Washing soda can remove both temporary and permanent hardness of water

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    Solution:

    Clarke's process removes only temporary  hardness of water.

    CaOH2 is the reagent used. It precipitates MgHCO32  as  MgOH2  and  CaHCO32   as  CaCO3.

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