1. Tardigrade
  2. Question
  3. Chemistry
  4. A colloidal sol is formed by mixing AgNO 3 and KI in 2: 1 molar ratio. This colloidal sol is to be coagulated by I. NaI II. MgSO 4 III. AlPO 4 Molar ratio of these required to coagulate 1 mole of colloidal sol is :

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Q. A colloidal sol is formed by mixing $AgNO _{3}$ and $KI$ in $2: 1$ molar ratio. This colloidal sol is to be coagulated by
I. $NaI$
II. $MgSO _{4}$
III. $AlPO _{4}$
Molar ratio of these required to coagulate 1 mole of colloidal sol is :

Surface Chemistry

Solution:

Colloidal sol is $[ AgI ] Ag ^{+}$
${[ AgI ] Ag ^{+}+ I ^{-} \longrightarrow 2 AgI }$
$2[ AgI ] Ag ^{+}+ SO _{4}^{2-} \longrightarrow 2 AgI + Ag _{2} SO _{4}$
$3[ AgI ] Ag ^{+}+ PO _{4}^{3-} \longrightarrow Ag _{3} PO _{4}+3 AgI$
thus $1 \,mol [ AgI ] Ag ^{+}$requires -
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