Question:
The bleaching of cotton fibres is carried out by __________ bleaching agent.
The bleaching of cotton fibres is carried out by __________ bleaching agent.
Show Hint
Sodium hydroxide (Option 1) is used for scouring and mercerization, but it is NOT a bleaching agent; it cleans but doesn't whiten pigments.
Updated On: May 26, 2026
- Sodium hydroxide
- Hydrogen peroxide
- Potassium chloride
- Sodium chloride
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Natural cotton has a yellowish tint due to natural pigments. Bleaching is the chemical process used to destroy these pigments to achieve a pure white base, which is necessary for white goods or for dyeing pastel shades.
Step 1: Selecting the Bleaching Agent.
While several chemicals can bleach textiles, the industry has shifted toward oxygen-based bleaches because they are more environmentally friendly than chlorine-based ones.
Step 2: The Role of Hydrogen Peroxide.
Hydrogen peroxide ($H_2O_2$) is the most widely used bleaching agent for cotton. Under alkaline conditions (usually provided by sodium hydroxide) and at high temperatures, it releases perhydroxyl ions that chemically break down the natural coloring matter without significantly degrading the cellulose fibers.
Step 1: Selecting the Bleaching Agent.
While several chemicals can bleach textiles, the industry has shifted toward oxygen-based bleaches because they are more environmentally friendly than chlorine-based ones.
Step 2: The Role of Hydrogen Peroxide.
Hydrogen peroxide ($H_2O_2$) is the most widely used bleaching agent for cotton. Under alkaline conditions (usually provided by sodium hydroxide) and at high temperatures, it releases perhydroxyl ions that chemically break down the natural coloring matter without significantly degrading the cellulose fibers.
Was this answer helpful?
0
0
Top CUET PG Textile Engineering Questions
- In \(\underline{\hspace{2cm}}\), the package is driven in frictional contact with the drum.
- In \(\underline{\hspace{2cm}}\), the yarn passes through two plates in which one plate is the baseplate and the other is a weighing plate.
- In case of plain weave fabric, the respective warp and weft counts are 30 tex and 20 tex, with 40 ends per cm and 30 picks per cm. The warp has 10% crimp and weft also 10% crimp. Calculate the weight of fabric in grams/square meter.
- In \(\underline{\hspace{2cm}}\) system, a warping beam with a complex pattern of colored stripes is obtained.
In the slasher sizing machine, the principle involved in drying the wet warp sheet by physical contact with a hot drum surface is \(\underline{\hspace{2cm}}\)
View More Questions
Top CUET PG Textile Bleaching Questions
Top CUET PG Questions
- Given below are two statements:
Statement I: For Plato the meaning of the word 'Justice' is basically a conception in the mind only.
Statement II: For Plato the meaning of the word 'Justice' is fixed, mind-independently
In the light of the above statements, choose the correct answer from the options given below: - What is the electron count of OS6CO182-?
- XeF4 hydrolysis gives A + B, HF, and Oxygen. Find A and B
- What is more basic in pyrol and pyridine?
- Hydrolysis of Al2C3, Be2?
View More Questions