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In the titration of Cl^(-)ions in soluti...

In the titration of `Cl^(-)`ions in solution with `AgNO_(3)` 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

A

adsorption of `Cl^(-)`ions by AgCl precipitate particles

B

adsorption of `NO^(3^(-))`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

Text Solution

Verified by Experts

The correct Answer is:
C
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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DISHA PUBLICATION-SURFACE CHEMISTRY-Exercise-2 :Concept Applicator
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  6. A chemical reaction has catalyst X. Hence X

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