Discussion
Assertion (A): A pressurised machine is needed for dyeing polyester with disperse dyes.
Reason (R): The temperature required lies above the boiling point of water at atmospheric pressure.
Answer: C
Both are true and the reason gives the necessity: carriers were the older alternative and are still used where a pressure machine is not available, at the cost of odour and additional effluent load. Pressure vessels are now standard for polyester.
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