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Q.

In the titration of Cl- ions in solution with AgNO3, sodium salt of fluorescein is used as an indicator. The equivalence point is marked with the appearance of reddish pink colour. This is due to

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a

adsorption of Cl- ions by AgCl precipitate particles

b

adsorption of NO3 ions by AgCl precipitate particles

c

adsorption of Ag+ ions by AgCl particles followed by adsorption of fluorescein anion.

d

reaction of fluorescein anion with Ag+ ions in the solution

answer is C.

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Detailed Solution

After equivalence point, the AgCl particles adsorb Ag+ ions (present in slight excess) and then fluorescein anion. The precipitate particles turn reddish pink due
to the complex formation between Ag+ and fluorescein anion.

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In the titration of Cl- ions in solution with AgNO3, sodium salt of fluorescein is used as an indicator. The equivalence point is marked with the appearance of reddish pink colour. This is due to