GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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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:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- 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 in the range of 0-4 °C during dye synthesis? | 04 |
| (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 heterocyclie'diazo & coupling components | 07 |
| 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 Pthalocyanine Pigments? | 07 |
| Q.8 (a) Most of the market is occupied with azo pigments. Justify | 03 |
| (b) 1) Basic Yellow 21 ii) Basic Orange 21 | 04 |
| (c) With properties, applications and method of synthesis, explain Prussian Blue pigments? | 07 |
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