A) Congo red
B) Aniline yellow
C) Alizarin
D) Indigo
Correct Answer: B
Solution :
Dyes are chemical substances used to impart colour to fabrics food and other e.g.. Acid dyes : (contain ?COOH group \[-\text{S}{{\text{O}}_{\text{3}}}\text{H}\]group and phenolic ?OH group) orange I, II and methyl orange methyl red. Basic dyes: (contain \[-\text{N}{{\text{H}}_{\text{2}}}\] group or\[\text{N}{{\text{R}}_{\text{2}}}\]), Aniline yellow, butter yellow crysodine. Direct dyes: Martins yellow, congo red Mordant dyes: Alizarin Insoluble azo dyes: nitro aniline
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