Chemistry of Dyes and Pigments exam (WPE 305), 2024 Level-3 Term-I, BUTEX affiliated colleges. Questions cover dye nomenclature like Procion Red M5B, nitro and triphenylmethane synthesis, indigo preparation, Colour Index use, and functional dyes for therapy and food.
Level-3 Term-I, Final Exám-2024
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) “All dyes are coloured substance but all coloured substances are not dyes”-Explain with proper example.
(b) Classify dyes and pigments based on chemical structure with example.
(c) Interpret the following commercial name of dyes - “Procion Red M5B”.
[3+6+3=12]
2. (a) Define nitro and nitroso dyes.
(b) Classify triphenylmethane dyes and synthesis each class.