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  1. Permanent hardness of water may be removed by addition of

    2. A.

     Alum
    B.

     Sodium carbonate
    C.

     Lime
    D.

     Potassium Permangante

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    Answer : Option B

    Explanation :

    Hardness can be removed by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

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