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  1. Threshold limit value of copper in the atmospheric air is

    2. A.

     0.001 mg/m3
    B.

     0.01 mg/m3
    C.

     1.0 mg/m3
    D.

     5.0 mg/m3

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    Answer : Option C

    Explanation :

    The threshold limit value (TLV) of copper in atmospheric air is 1.0 mg/m3.

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