Discussion
Assertion (A): Residual alkali must be removed completely after mercerising.
Reason (R): Alkali left in the fabric interferes with dyeing and can degrade the cellulose in storage.
Answer: A
Both are true and the reason gives both consequences: the pH of the dried fabric is a routine quality check for exactly this reason, and a piece that fails it goes back for further rinsing rather than forward to the dyehouse.
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