Chemistry of Dyes and Pigments paper (WPE 305) from the 2021 Level-3 Term-I finals, BUTEX affiliated colleges. Questions address reactive dye hydrolysis prevention, disperse dyeing of polyester, azo dye nomenclature, Colour Index generic names, metal complex dyes, and ink jet ink requirements.
Level-3 Term-I, Final Exám-2021
Subject: Chemistry of Dyes and Pigments (Code: WPE 305)
Time: 3.0 Hrs. Full Marks: 72
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) Why reactive dye is so called?
(b) Briefly discuss the chemistry of reactive dyeing with the general structure.
(c) Describe the hydrolysis of reactive dye. How we can prevent this?
[3+5+4 = 12]
2. (a) Why disperse dye is so called?
(b) Write some properties of good pigments?
(c) Describe the dyeing mechanism of disperse dye with polyester fiber.
[3+4+5 = 12]