JEE Main & Advanced Chemistry Chemistry in Everyday Life / दैनिक जीवन में रसायन Question Bank

done Dyes and Pigment Total Questions - 29

• question_answer1)
  An azo dye is fixed on fabrics by the process applicable in
  A)
                  Vat dyes              done clear
  B)
                  Mordant dyes done clear
  C)
                  Developed dyes               done clear
  D)
                  Substantive dyes done clear
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• question_answer2)
  Red ink is prepared from
  A)
                  Phenol  done clear
  B)
                  Aniline done clear
  C)
                  Congo red           done clear
  D)
                  Eosin done clear
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• question_answer3)
  The blue print process involves the use of
  A)
                  Indigo dyes         done clear
  B)
                  Vat dyes done clear
  C)
                  Iron compounds               done clear
  D)
                  Zinc compounds done clear
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• question_answer4)
  An azo dye is formed by interaction of an aromatic diazonium chloride with
  A)
                  A phenol done clear
  B)
                  An aliphatic primary amine done clear
  C)
                  Benzene done clear
  D)
                  Nitrous acid done clear
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• question_answer5)
  Alizarin belongs to the class of
  A)
                  Vat dyes              done clear
  B)
                  Mordant dyes done clear
  C)
                  Substantive dyes             done clear
  D)
                  Reactive dyes done clear
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• question_answer6)
  An insoluble coloured compound formed by action of metallic salts on dyes is known as
  A)
                  Lake       done clear
  B)
                  Mordant done clear
  C)
                  Dye intermediate            done clear
  D)
                  None of these done clear
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• question_answer7)
  Alizarin dye obtained from the root of madder plant is anthraquinone derivative. Its structure corresponds to
  A)
                  1, 2-dihydroxy anthraquinone    done clear
  B)
                  2, 3-dihydroxy anthraquinone    done clear
  C)
                  1, 4-dihydroxy anthraquinone    done clear
  D)
                  1-hydroxy anthraquinone done clear
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• question_answer8)
  To which class of dyes does phenolphthalein belong
  A)
                  Azo dyes done clear
  B)
                  Nitro dyes done clear
  C)
                  Triphenyl methane dyes done clear
  D)
                  Phthalein dyes done clear
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• question_answer9)
  Alizarin a mordant dye is not used in       [CPMT 1990]
  A)
                  Cotton dyeing done clear
  B)
                  Printing done clear
  C)
                  Painting                done clear
  D)
                  Chromium lakes for wood dyeing done clear
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• question_answer10)
  The rose odour from an ester is formed by the action of HCOOH on
  A)
                  Pine oil done clear
  B)
                  Olive oil done clear
  C)
                  Geraniol               done clear
  D)
                  Turpentine oil done clear
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• question_answer11)
  Which of the following is dye
  A)
                  Methyl orange done clear
  B)
                  Orange I done clear
  C)
                  Aniline yellow    done clear
  D)
                  All of these done clear
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• question_answer12)
  Which of the following is an example of basic dye
  A)
                  Alizarin done clear
  B)
                  Malachite green done clear
  C)
                  Indigo   done clear
  D)
                  Orange I done clear
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• question_answer13)
  Which of the following is a direct dye
  A)
                  Phenolphthalein              done clear
  B)
                  Congo red done clear
  C)
                  Alizarin done clear
  D)
                  Indigo done clear
  View Solution play_arrow

• question_answer14)
  Which of the following is a vat dye and often used in dyeing jeans
  A)
                  Indigo   done clear
  B)
                  Alizarin done clear
  C)
                  Picric acid             done clear
  D)
                  Crystal violet done clear
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• question_answer15)
  Which of the following is not a chromophore
  A)
                  \[-N=N-\]            done clear
  B)
                  \[-NO\] done clear
  C)
                  \[-N{{O}_{2}}\] done clear
  D)
                  \[-N{{H}_{2}}\] done clear
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• question_answer16)
  The compounds used to fix a dye to the fabric is known as
  A)
                  Mordant              done clear
  B)
                  Azeotrope done clear
  C)
                  Bleaching agents              done clear
  D)
                  Lake    done clear
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• question_answer17)
  Which one is disperse dye
  A)
                  Congo red           done clear
  B)
                  Alizarin done clear
  C)
                  Celliton done clear
  D)
                  None of these done clear
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• question_answer18)
  Malachite green is a direct dye for silk and wool. It is prepared by condensing
  A)
                  Benzaldehyde and dimethyl aniline done clear
  B)
                  Carbonyl chloride and dimethyl aniline done clear
  C)
                  Benzene diazonium chloride with dimethyl aniline done clear
  D)
                  None of the above  done clear
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• question_answer19)
  Fluorescin, a well known dye is obtained by the reactions of
  A)
                  Phthalic anhydride and phenol done clear
  B)
                  Phthalic anhydride and resorcinol done clear
  C)
                  Succinic acid and resorcinol          done clear
  D)
                  Phthalic anhydride and catechol done clear
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• question_answer20)
  Indigo shows cis-trans isomerism. Which is the stable form of Indigo
  A)
                  Cis          done clear
  B)
                  Trans done clear
  C)
                  Either cis or trans             done clear
  D)
                  Both of the above  done clear
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• question_answer21)
  Which is the wrong statement with regards to Indigo
  A)
                  Indigo was extracted in India from plants of the 'Indigo ferra' group done clear
  B)
                  The chemical structure of Indigo was determined by Baeyer, a German chemist who also synthesized it done clear
  C)
                  Indigo is a dark blue solid soluble in water giving a blue solution done clear
  D)
                  Indigo is fixed to fabrics by the vat process done clear
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• question_answer22)
  Which of the following structures represents a colourless substance
  A)
                  \[{{C}_{6}}{{H}_{5}}-N=\underset{\underset{O}{\mathop{|}}\,}{\mathop{N}}\,-{{C}_{6}}{{H}_{5}}\] done clear
  B)
                  \[{{C}_{6}}{{H}_{5}}-N=N-{{C}_{6}}{{H}_{5}}\]     done clear
  C)
                  \[{{C}_{6}}{{H}_{5}}-NH-NH-{{C}_{6}}{{H}_{5}}\] done clear
  D)
                  None of these done clear
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• question_answer23)
  Identify the wrong statement regarding alizarin
  A)
                  Alizarin was extracted from the roots of the madder plant done clear
  B)
                  It's chemical name is 1, 2-dihydroxy anthraquinone done clear
  C)
                  It is fixed to fabrics by using mordants like aluminium sulphate giving fast red colour        done clear
  D)
                  It has red crystal soluble in alkalies and the solution imparts red colour to fabrics    done clear
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• question_answer24)
  Methyl orange is an indicator in acid-alkali titration. It gives         
  A)
                  Yellow colour in alkaline medium              done clear
  B)
                  Red colour in acid medium done clear
  C)
                  Yellow colour in acid medium     done clear
  D)
                  Yellow colour in alkaline medium and red colour in acid medium    done clear
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• question_answer25)
  A dye imparts red colour on fabric. What colour of light was absorbed by the dye
  A)
                  Blue       done clear
  B)
                  Red done clear
  C)
                  Green   done clear
  D)
                  Orange    done clear
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• question_answer26)
  Which of the following is an azo dye        [Delhi CEE 1996]
  A)
                  Orange-I              done clear
  B)
                  Phenolphthalein done clear
  C)
                  Malachite green               done clear
  D)
                  Methylene blue    done clear
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• question_answer27)
  An example of anthraquinone dye is      [Haryana CEET 1999]
  A)
                  Alizarin done clear
  B)
                  Basic acid done clear
  C)
                  Methylene blue               done clear
  D)
                  Phenolphthalein done clear
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• question_answer28)
  Which of the following is a basic dyes [Pb. PMT 1998; AFMC 2004]
  A)
                  Congo Red          done clear
  B)
                  Aniline Yellow done clear
  C)
                  Alizarin done clear
  D)
                  Indigo    done clear
  View Solution play_arrow

• question_answer29)
  The dyes which are applied to the fabric in the colourless reduced state and then oxidised to coloured state are called [DPMT 2004]
  A)
                  Vat dyes              done clear
  B)
                  Disperse dyes done clear
  C)
                  Triphenyl methane dye done clear
  D)
                  Azo dyes done clear
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