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  1. A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

    2. A.
    350
    B.
    485
    C.
    140
    D.
    345

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    Answer : Option A

    Explanation :

    No answer description available for this question.

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