JEE Main · 2021 · 22 Jul 2021 · Shift 2 · Surface Chemistry

When silver nitrate solution is added to potassium iodide solution then the sol produced is:

(A) $AgI / I^{-}$ ✓ Correct
(B) $AgNO_{3} / NO_{3}^{-}$
(C) $KI / NO_{3}^{-}$
(D) $AgI / Ag^{+}$

Answer: (A)

Solution

Adding silver nitrate to potassium iodide solution precipitates silver iodide while iodide ion is still present in excess in the medium. A fresh precipitate adsorbs by preference the ion that belongs to its own lattice, so iodide ions are held on the surface of the silver iodide particles and the sol carries a negative charge. The sol produced is

AgI/ I^{-}

JEE Main · 2021 · 22 Jul 2021 · Shift 2 · Single correct option

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