Multiple choice

------------------- is used as a dye and a pH indicator.

  1. Azo violet

  2. Benzaldehyde

  3. Azithromycin

  4. Benzalkonium chloride
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A Correct answer
Explanation

Azo violet is used as a dye and a pH indicator. It forms blue colour with magnesium in slightly alkaline medium. This reaction depends on adsorption of the dye on magnesium hydroxide. Ammonium ions reduce sensitivity of reaction.

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