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(chemistry) An aromatic azo compound, diphenyl diazene, the basis of many dyes.
With aniline and acetic acid it yields azobenzene.
In alkaline solution azobenzene results, while arsenic acid produces the violet-colouring matter violaniline.
Potassium permanganate in neutral solution oxidizes it to nitrobenzene, in alkaline solution to azobenzene, ammonia and oxalic acid, in acid solution to aniline black.
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