Multiple choice

Which of the following dye is used as an indicator in acid base titration?

  1. Indigo

  2. Aniline Yellow

  3. Methyl Orange

  4. Malachite green
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This belongs to the azodyes. It is prepared by coupling diazotized sulphanilic acid with dimethylaniline.This acid dye is used for wool and silk. It imparts an orange colour,  though the colour is not fast to light , or washing. It is used in acid-base titrations, as an indicator and gives a yellow colour with base and pink with acid.

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