Chemistry of Dyes & Pigments exam (WPE 305) from BUTEX affiliated colleges' 2020 Level-3 Term-I finals. Covers Newton's colour theory, dye classifications, laking, azo tautomerism, diazotization conditions, anthraquinone applications, food colorant health views, and CAS numbers.
Level-3 Term-I, Final Exám-2020
Subject: Chemistry of Dyes & 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) Explain Newton's color theory.
(b) Write the differences between dyes and pigments.
(c) Classify dyes according to method of application and chemical constitution.
[4+4+4=12]
2. (a) What is laking?
(b) Define binder. What are the characteristics of a good binder?
(c) What is tautomerism of Azo dye?
(d) Write some applications of anthraquinone dye.