Discussion
Assertion (A): A softener for a brightened white is chosen with some care.
Reason (R): A cationic product can interact with the anionic brightener and quench its fluorescence.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Most brighteners for cellulose are anionic, and a cationic softener forms an insoluble complex with them that quenches the fluorescence - so a white that measured well before softening comes out visibly duller after it. Non-ionic or specially compatible softeners are used on brightened whites for exactly this reason.
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