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  1. Permanent hardness of water can be removed by

    2. A.
    addition of soda ash to it.
    B.
    treating it with zeolites.
    C.
    passing it through sodium hexametaphosphate.
    D.
    all (a), (b), and (c).

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    Answer : Option D

    Explanation :

    No answer description available for this question.

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