Azo dyes contain the group
Correct answer: A. N=N joining two aromatic rings
- A. N=N joining two aromatic rings
- B. C=O
- C. OH only
- D. COOH
Explanation
The azo group links two aromatic systems into one extended conjugated network, and the resulting absorption in the visible region makes these compounds strongly coloured, which is why azo dyes are the largest commercial class. They are made by coupling a diazonium salt with a phenol or an aromatic amine. Varying the rings and their substituents produces the whole range of shades.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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.
Practise Industrial Chemistry
292 free Industrial Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Dyes questions
The part of a dye molecule responsible for its colour is called the
A dye differs from a pigment in that a dye
A mordant is used in dyeing to
Alum is used by dyers of cloth:
The most useful dye for those fabric which can form hydrogen bonds is:_____________?
Choose group that cause solubility of the dye in acids.