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  1. The maximum permissible colour for domestic supplies based on cobalt scale, is

    2. A.
    5 ppm
    B.
    10 ppm
    C.
    15 ppm
    D.
    20 ppm
    E.
    25 ppm.

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    Answer : Option D

    Explanation :

    No answer description available for this question. Let us discuss.

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