Which will produce hard water ?

Which will produce hard water ?

  1. A

    Saturation of water with CaSO4

  2. B

    Addition of Na2SOto water

  3. C

    Saturation of water with CaCO3

  4. D

    Saturation of water with MgCO3

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    Solution:

    (1) Presence of Chlorides and sulphates  of  Ca and Mg causes permanent hardness.

    (2) Presence of bicarbonates of ca and Mg causes temporary hardness.

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