Choose group that cause solubility of the dye in acids.
Correct answer: B. -NH2
- A. -OH
- B. -NH2
- C. -SO2H
- D. -COOH
Explanation
Amines are used in making azo dyes and nylon apart from medicines and drugs. They are widely used in developing chemicals for crop protection, medication, and water purification. They also find use in products of personal care. Ethanol amines are the most common type of amine used in the global market.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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About Dyes
Dyes are coloured organic compounds that form a stable bond or strong attraction with fibres, while pigments are generally insoluble and need a binding medium. The topic covers chromophores, auxochromes and conjugated systems, as well as acid, basic, direct, reactive, azo and mordant dyes.
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