Q95 · CSIR-NET Chemistry, June 2012

Paper: CSIR-NET June 2012 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Surface Chemistry – General · Marks: 2 · Difficulty: Medium

A dilute silver nitrate solution is added to a slight excess iodide solution. A solution of AgI is formed whose surface adsorbs.
(a)$\mathrm{I}^{-}$
(b)$\mathrm{NO}_{3}^{-}$
(c)$\mathrm{Na}^{+}$
(d)$\mathrm{Ag}^{+}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
With iodide in excess, the AgI particles preferentially adsorb the common ion I⁻ (Paneth–Fajans–Hahn rule), acquiring a negative charge.

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