Dyes, Paints and Pigments — Practice Quiz
Telangana Open School (TOSS) · Class 12 · Chemistry
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Quick Quiz: Dyes, Paints and Pigments
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What is the primary function of a dye?
Which of the following is a natural source of dyes?
Which group is known as a chromophore in dyes?
Which of the following is an auxochrome?
Sample Questions
What is the wavelength range of visible light?
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400–730 nm
Visible light ranges from 400 nm (violet) to 730 nm (red). Dyes absorb light in this range and reflect complementary colors.
If a dye absorbs green light, what color will it appear?
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Violet
A dye appears in the complementary color of the light it absorbs. Green's complement is violet.
Which structural unit is characteristic of azo dyes?
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–N=N–
Azo dyes contain the –N=N– group, which is a strong chromophore. Methyl orange is a common example.
Which dye is an example of a triphenylmethane dye?
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Malachite green
Malachite green has a triphenylmethane structure and is used as a basic dye.
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