Download GTU BE/B.Tech 2019 Summer 4th Sem New 2143604 Chemistry Of Intermediates And Colorants Ii Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2143604 Chemistry Of Intermediates And Colorants Ii Previous Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2143604 Date:17/05/2019
Subject Name: Chemistry of Intermediates & Colorants-II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) What is Colour? How it can be measured? 03
(b) Define: i) Trichromat ii) Dichromat. 04
(c) With suitable reaction mechanism, explain the concept of coupling. 07

Q.2 (a) What do you mean by tristimulus values? 03
(b) Explain additive & subtractive colour mixing with suitable example? 04
(c) With suitable reaction mechanism, explain the concept of diazotization. 07
OR
(c) Explain attributes of colour with the help of chromaticity diagram. 07

Q.3 (a) Explain the classification of dyes on the basis of chromophore. 03
(b) With suitable reaction mechanism, elaborate the replacement of halogen of
cyanuric chloride with change in temperature.
04
(c) Discuss the synthesis of Vinyl sulphone reactive system with suitable chemical
reaction.
07
OR
Q.3 (a) What are reactive dyes? Give their properties. 03
(b) Explain basic dyes with reference to its classification, properties and
applications.
04
(c) Explain the concept of fluorescence, phosphorescence briefly by the Jablonski
diagram.
07

Q.4 (a) What are the applications of reactive dyes? 03
(b) Give the chemical structures of following diazo components used for reactive
dyes: a. H-Acid b. Metanilic Acid c. Tobias Acid d. Sulphanilic Acid
04
(c) What is CIE LAB system? 07
OR
Q.4 (a) Give the synthesis of cyanuric chloride with its physical properties. 03
(b) What are FBAs? Give its applications. 04
(c) Explain spectral reflectance curve generated by spectrophotometer. 07

Q.5 (a) Explain vat dyes with its applications. 03

(b)
Give the examples of following type of disperse dyes with its chemical
structure: a. Anthraquinone disperse dye.
04
(c) Discuss disperse dyes with its classification & examples. 07
OR
Q.5 (a) How would you apply a reactive dye on cellulose fibre? 03
(b) Explain the application scheme of vat dyes on fibre with example. 04
(c) Give the synthesis of azo dyes with its physical properties. 07

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