Discussion
Mercerisation of cotton is carried out with
Answer: A
Correct answer: concentrated sodium hydroxide under tension
Mercerisation swells the cotton in strong caustic soda - around 20 to 26 per cent, or about 50 degrees Twaddell - while the fabric is held stretched. Both parts are essential: the caustic swells and reorganises the cellulose, and the tension prevents the shrinkage that would otherwise accompany the swelling and would cost the lustre.
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