Alizarin is an example of

• A

  Triayl dye
• B

  Azo dye
• C

  Vat dye
• Correct answer
  D

  Anthraquinone dye

Solution

Alizarin is an anthraquinone dye. It gives a bright red colour with aluminium and a blue colour with barium.

Hence, the correct answer is option: 'D'.