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Chemistry In Action Test - 2
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Chemistry In Action Test - 2
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  • Question 1/9
    1 / -0

    Which of the following is an example of basic dye

    Solutions

    Basic dyes contain NH2 or -NR2 groups as colour bearing group or colour enhancing groups they are generally used for Wool, cotton, leather, paper, polyester, nylon etc. e.g. aniline yellow, crysodine G, butter yellow, malachite green etc.

     

  • Question 2/9
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    Which of the following is a direct dye

    Solutions

    Direct dyes stick to the fibre through hydrogen bonding. They belong to the class of azo dyes. They are used to dye the fabric directly by placing it in not aqueous solution of dye e.g. martius yellow, Congored etc.

     

  • Question 3/9
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    Which of the following is a vat dye and often used in dyeing jeans

    Solutions

    Vat dyes are insoluble compounds which up on reduction give soluble (lencoform) product. The product may be either coloured or colourless and have affinity for specific fabrics e.g. Indigo.

     

  • Question 4/9
    1 / -0

    Which one is disperse dye

    Solutions

    Disperse dye are usually applied in the form of dispersion of finely divided dye in a soap solution in the presence of Phenol, Cresol, Benzoic acid etc. They are mainly used to dye decron, nylon, synthetic fibre. Example Celliton (blue).

     

  • Question 5/9
    1 / -0

    Malachite green is a direct dye for silk and wool. It is prepared by condensing

    Solutions

    Malachite green prepared by the condensation of Benzaldehyde and dimethyl aniline.

     

  • Question 6/9
    1 / -0

    Fluorescin, a well known dye is obtained by the reactions of

    Solutions

    Fluorescin is obtained by the reaction of Phthalic anhydride and resorcinol.

     

  • Question 7/9
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    Indigo shows cis-trans isomerism. Which is the stable form of Indigo

    Solutions

    Trans form of Indigo is more stable.

     

  • Question 8/9
    1 / -0

    Which is the wrong statement with regards to Indigo

    Solutions

    Indigo is dark blue solid insoluble in water.

     

  • Question 9/9
    1 / -0

    Methyl orange is an indicator in acid-alkali titration. It gives

    Solutions

    Methyl orange is yellow in alkaline medium and red in acedic medium.

     

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