Dyes and Pigments MCQs: CSIR | GATE | JAM | SLET
These multiple-choice questions (MCQs) are based on the topic Dyes and Pigments asked in exams like CSIR NET Chemical Sciences, GATE Chemistry, IIT JAM Chemistry, and SLET.
Must read: Comprehensive Notes: Dyes
Comprehensive Notes on Dyes and Pigments
CSIR NET Chemical Sciences, June 2018
1. Which of the following is an example of an azo dye?
(a) Malachite green
(b) Indigo
(c) Orange-I
(d) Martius yellow
GATE Chemistry, 2020
2. The principal chromophore in azo dyes is:
(a) C=N
(b) N=N
(c) N≡N
(d) C≡N
IIT JAM Chemistry, 2019
3. Auxochromes in dyes are groups that:
(a) Impart color to the dye
(b) Modify the color and increase solubility
(c) Act as the main color-producing unit
(d) Make the dye insoluble
CSIR NET Chemical Sciences, December 2017
4. Which of the following is a vat dye?
(a) Alizarin
(b) Indigo
(c) Congo red
(d) Methyl orange
GATE Chemistry, 2016
5. The difference between dyes and pigments is that pigments are:
(a) Soluble in water
(b) Insoluble and used in suspension
(c) Always organic
(d) Used only for textiles
IIT JAM Chemistry, 2021
6. An example of a natural pigment is:
(a) Phthalocyanine
(b) Titanium dioxide
(c) Carmine
(d) Azo red
SLET Chemistry (Maharashtra), 2015
7. The group -OH is an example of:
(a) Chromophore
(b) Auxochrome
(c) Both
(d) Neither
CSIR NET Chemical Sciences, June 2022
8. Methyl orange is an example of:
(a) Acid dye
(b) Basic dye
(c) Indicator dye
(d) Vat dye
GATE Chemistry, 2023
9. According to Witt's theory, dyes must have:
(a) Chromophore only
(b) Auxochrome only
(c) Both chromophore and auxochrome
(d) Neither
IIT JAM Chemistry, 2017
10. Phthalocyanine is used as:
(a) Red pigment
(b) Blue pigment
(c) Yellow dye
(d) Green dye
SLET Chemistry (Tamil Nadu), 2019
11. The chromophore in nitro dyes is:
(a) -NO2
(b) -N=N-
(c) >C=O
(d) -OH
CSIR NET Chemical Sciences, December 2020
12. Which dye is used for cotton and is a direct dye?
(a) Alizarin
(b) Congo red
(c) Indigo
(d) Malachite green