A) mordant dye
B) nitro dye
C) acid dye
D) basic dye
Correct Answer: C
Solution :
Methyl orange is an example of acid dye. Acid dyes are azo dyes and are characterised by acid groups like sulphonic acid \[(-S{{O}_{3}}H)\], carboxylic acid \[(-COOH)\] and phenolic group. They are used for silk, nylon and wool. A dye which impart different colours to different fabrics in the presence of different metal ions is called mordant dye. Basic dyes contain \[-N{{H}_{2}}\] group or \[-N{{R}_{2}}\] group as chromophore or auxochrome.
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