Identify colour change when NaCl solution is titrated against AgNO_3 solution using fluorescein indicator.

MHT CET 2026 Chemistry question

Identify colour change when NaCl solution is titrated against solution using fluorescein indicator.

(A)Colourless to pale yellow
(B)Reddish pink to pale yellow
(C)Pale yellow to reddish pinkCorrect
(D)Colourless to reddish pink

Answer: (C)

Solution

This is a Fajans (adsorption indicator) argentometric titration. Before the end point, AgCl precipitate adsorbs excess ions (primary layer), so the negatively charged colloidal particles repel the anionic fluorescein and the solution stays pale yellow (yellowish-green). At the end point the first

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Question ID VK-099961