Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3153620 Synthetic Colourants Previous Question Paper
Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3153620 Date:01/02/2021
Subject Name:Synthetic Colourants
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1
(a) Define: diazotization and coupling
03
(b) What will happen if we fail to maintain temperature of reaction
04
in the range of 0-4 0C during dye synthesis?
(c) Give the various applications of synthetic colorants?
07
Q.2
(a) Write a short note on: Mordant Azo Dyes
03
(b) Give the properties of: 1. Aniline yellow 2. Methyl Red
04
(c) Give the synthesis of methyl orange with reaction mechanism?
07
Q.3
(a) What do you mean by chromogens?
03
(b) Classify reactive dyes on the basis of its functionality?
04
(c) Discuss reactive dyes with vinyl sulphone reactive system?
07
Q.4
(a) Explain the steps of reactive dyeing
03
(b) What do you mean by fixation?
04
(c) Explain Hot Brand and Cold Brand Reactive Dyes?
07
Q.5
(a) What is difference between solution & dispersion?
03
(b) What are AQ azo dyes? Explain with example?
04
(c) Elaborate synthesis and applications of disperse dyes?
07
Q.6
(a) What is neutral fixing?
03
(b) Explain anthraquinone dyes with its applications?
04
(c) Discuss anthraquinone disperses dyes with reference to
07
heterocyclic diazo & coupling components
Q.7
(a) What is the practical significance of bathochromic shift?
03
(b) Explain the application of CPC Blue pigments?
04
(c) With properties, applications and method of synthesis, explain
07
Pthalocyanine Pigments?
Q.8
(a) Most of the market is occupied with azo pigments. Justify
03
(b) i) Basic Yellow 21 ii) Basic Orange 21
04
(c) With properties, applications and method of synthesis, explain
07
Prussian Blue pigments?
1
This post was last modified on 04 March 2021