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 :

Question

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 : (A) 1: 1: 1 (B) 1: 2: 3 (C) 3: 2: 1 (D) 6: 3: 2

Tardigrade Admin · Accepted Answer

Colloidal sol is [ AgI ] Ag + [ AgI ] Ag ++ I - longrightarrow 2 AgI 2[ AgI ] Ag ++ SO 42- longrightarrow 2 AgI + Ag 2 SO 4 3[ AgI ] Ag ++ PO 43- longrightarrow Ag 3 PO 4+3 AgI thus 1 mol [ AgI ] Ag +requires - <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/84b985d125d950f0050d9a13c567e5f2-.png" />

Q. A colloidal sol is formed by mixing $A g N O_{3}$ and $K I$ in $2 : 1$ molar ratio. This colloidal sol is to be coagulated by
I. $N a I$
II. $M g S O_{4}$
III. $A lP O_{4}$
Molar ratio of these required to coagulate 1 mole of colloidal sol is :

1 : 1 : 1

1 : 2 : 3

3 : 2 : 1

6 : 3 : 2

Colloidal sol is $[A g I] A g^{+}$
$[A g I] A g^{+} + I^{-} ⟶ 2 A g I$
$2 [A g I] A g^{+} + S O_{4}^{2 -} ⟶ 2 A g I + A g_{2} S O_{4}$
$3 [A g I] A g^{+} + P O_{4}^{3 -} ⟶ A g_{3} P O_{4} + 3 A g I$
thus $1 m o l [A g I] A g^{+}$ requires -

Q. A colloidal sol is formed by mixing AgNO3​ and KI in 2:1 molar ratio. This colloidal sol is to be coagulated by I. NaI II. MgSO4​ III. AlPO4​ Molar ratio of these required to coagulate 1 mole of colloidal sol is :