The silky finish of mercerized cotton is obtained by treating cotton with a solution of:
Correct answer: A. NaOH
- A. NaOH
- B. NaHCO3
- C. Na2CO3
- D. Na2CO3. 2H2O
Explanation
Mercerization is an industrial process involving sodium hydroxide for cotton yarns or fabrics to increase the luster and dyeability.It is a chemical treatment for cellulosic material such as cotton fibres for yarns. The yarn is dipped in a 20% sodium hydroxide bath, followed by an acid bath.In mercerization cotton fabric is treated with caustic soda which swells up the cotton fibers in cotton fabric adding below properties.• Improved luster• Increased ability to absorb dye• Improved reactions with a variety of chemicals• Improved stability of form• Improved strength/elongation• Improved smoothness• Improved hand
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