Question:
_________ dyes are referred to as ice dyes.
_________ dyes are referred to as ice dyes.
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These dyes are formed on the fibre in a cold bath kept with ice, and are also called naphthol dyes.
Updated On: Oct 19, 2026
- Acid
- Azoic
- Sulphur
- Disperse
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understand the term:
Ice dyes are dyes that are developed on the fibre at a very low temperature.
Ice is added to keep the bath cold, so the name 'ice dyes' came into use.
Step 2: Identify the dye class:
Azoic dyes are also called naphthol dyes.
They form on the fibre itself. The fabric is first soaked in a naphthol solution. It is then passed through a cold diazotised base.
The two react on the fibre and form an insoluble coloured compound. The cold bath is kept with ice.
Step 3: Why the other options are wrong:
Acid dyes are applied from a hot acid bath, mainly on wool, silk and nylon.
Sulphur dyes are applied from a hot alkaline sodium sulphide bath on cotton.
Disperse dyes are used on polyester and acetate at high temperature.
Final Answer:
Azoic dyes are called ice dyes. The correct option is (B).
Ice dyes are dyes that are developed on the fibre at a very low temperature.
Ice is added to keep the bath cold, so the name 'ice dyes' came into use.
Step 2: Identify the dye class:
Azoic dyes are also called naphthol dyes.
They form on the fibre itself. The fabric is first soaked in a naphthol solution. It is then passed through a cold diazotised base.
The two react on the fibre and form an insoluble coloured compound. The cold bath is kept with ice.
Step 3: Why the other options are wrong:
Acid dyes are applied from a hot acid bath, mainly on wool, silk and nylon.
Sulphur dyes are applied from a hot alkaline sodium sulphide bath on cotton.
Disperse dyes are used on polyester and acetate at high temperature.
Final Answer:
Azoic dyes are called ice dyes. The correct option is (B).
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