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    Question

    Which of the following dyes is used for colouring Paper

    and typewriters?
    A Nitro Dyes Correct Answer Incorrect Answer
    B Triphenyl methane Dyes Correct Answer Incorrect Answer
    C Azo Dyes Correct Answer Incorrect Answer
    D Mordant Dyes Correct Answer Incorrect Answer

    Solution

    Triphenyl Dyes contains the paraquinoid moiety as a chromophore and -OH, -NHâ‚‚ as auxochrome. These dyes are not fast to light and washing and hence used for colouring Papers or typewriters.

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