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WorksheetsTextile and dye
Total questions: 29
Worksheet time: 15mins
An azo dye is fixed on fabrics by the process applicable in
Vat dye
Mordant dye
Developed dye
Substantive dye
Red ink is prepared from
Phenol
Aniline
Congo red
Eosin
The blue print process involves the use of
Indigo dyes
Vat dye
Iron compounds
Zinc compounds
An azo dye is formed by interaction of an aromatic diazonium chloride with
Nitrous acid
A phenol
Benzene
An aliphatic primary amine
Alizarin belongs to the class of
Reactive dyes
Substantive dyes
Mordant dyes
Vat dyes
An insoluble coloured compound formed by action of metallic salts on dyes is known as
None of these
Dye intermediate
Mordant
Lake
Alizarin dye obtained from the root of madder plant is anthraquinone derivative. Its structure
corresponds to
1-hydroxy anthraquinone
1, 4-dihydroxy anthraquinone
1, 2-dihydroxy anthraquinone
None of these
To which class of dyes does phenolphthalein belong
Phthalein dyes
Nitro dyes
Triphenyl methane dyes
Azo dyes
Alizarin a mordant dye is not used in
Chromium lakes for wood dyeing
Painting
Printing
Cotton dyeing
The rose odour from an ester is formed by the action of HCOOH on
Turpentine oil
Olive oil
Geraniol
Pine oil
Which of the following is dye
All of these
Aniline yellow
Orange I
Methyl orange
Which of the following is an example of basic dye
Orange I
Indigo
Alizarin
Malachite green
Which of the following is a direct dye
Alizarin
Indigo
Congo red
Phenolphthalein
Which of the following is a vat dye and often used in dyeing jeans
Crystal violet
Picric acid
Alizarin
Indigo
Which of the following is not a chromophore
−NH2
−NO2
−N=N−
−NO
The compounds used to fix a dye to the fabric is known as
Lake
Bleaching agents
Azeotrope
Mordant
Which one is disperse dye
None of these
Celliton
Alizarin
Congo red
Malachite green is a direct dye for silk and wool. It is prepared by condensing
Benzaldehyde and dimethyl aniline
Benzene diazonium chloride with dimethyl aniline
Carbonyl chloride and dimethyl aniline
None of the above
Fluorescin, a well known dye is obtained by the reactions of
Phthalic anhydride and catechol
Succinic acid and resorcinol
Phthalic anhydride and resorcinol
Phthalic anhydride and phenol
Indigo shows cis-trans isomerism. Which is the stable form of Indigo
Cis
Trans
Either cis or trans
Both of the above
Which is the wrong statement with regards to Indigo
Indigo was extracted in India from plants of the 'Indigo ferra' group
The chemical structure of Indigo was determined by Baeyer, a German chemist who also synthesized it
Indigo is a dark blue solid soluble in water giving a blue solution
Indigo is fixed to fabrics by the vat process
Which of the following structures represents a colourless substance
C6H5−N=N−C6H5
C6H5−NH−NH−C6H5
C6H5−N=N|O−C6H5
None of these
Identify the wrong statement regarding alizarin
It has red crystal soluble in alkalies and the solution imparts red colour to fabrics
It is fixed to fabrics by using mordants like aluminium sulphate giving fast red colour
Alizarin was extracted from the roots of the madder plant
It's chemical name is 1, 2-dihydroxy anthraquinone
Methyl orange is an indicator in acid-alkali titration. It gives
Yellow colour in acid medium
Yellow colour in alkaline medium
Red colour in acid medium
Yellow colour in alkaline medium and red colour in acid medium
A dye imparts red colour on fabric. What colour of light was absorbed by the dye
Orange
Green
Red
Blue
Which of the following is an azo dye
Methylene blue
Malachite green
Orange-I
Phenolphthalein
Which of the following is a basic dyes
Indigo
Alizarin
Aniline Yellow
Congo Red
An example of anthraquinone dye is
Methylene blue
Alizarin
Basic acid
Phenolphthalein
The dyes which are applied to the fabric in the colourless reduced state and then oxidised to coloured
state are called
Azo dyes
Disperse dyes
Triphenyl methane dye
Vat dyes
