Permanent hardness due to Mg2+ ions is best removed by

Permanent hardness due to Mg2+ ions is best removed by

  1. A

    CaOH2

  2. B

    Na2CO3

  3. C

    NaOH

  4. D

    Boiling

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    Solution:

    Both temporary and permanent hardness is removed by Na2CO3.

    M2+ + Na2CO3  MCO3  + 2Na+

    Insoluble carbonates can be removed by filtration.

     

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