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  1. The flux commonly used in brazing is

  2. A.

     Ammonium chloride

    B.

     Borax

    C.

     Zinc chloride

    D.

     Resin plus alcohol

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    Answer : Option B

    Explanation :

    Traditionally borax was used as a flux for brazing, but there are now many different fluxes available, often using active chemicals such as fluorides as well as wetting agents.


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