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a
The colour of a dye is the colour of the light it reflects
b
The colour of a dye is the colour of the light it absorbs
c
Blue is the complimentary colour of yellow
d
-CO2H is an auxochrome.
answer is B.
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Detailed Solution
The colour of the dye is the colour of the light it absorbs is not true. The color of a dye is dependent upon the ability of the substance to absorb light within the visible region of the electromagnetic spectrum (380-750 nm).