A freshly obtained precipitate of SnO2 is peptised by little of KOH to give a sol. The sol particles maybe represanted as

A freshly obtained precipitate of SnO₂ is peptised by little of KOH to give a sol. The sol particles maybe represanted as

A
$[{SnO}_{2}] K^{+}$
B
$[{SnO}_{2}] {OH}_{2}^{-}$
C
$[{SnO}_{2}] {Sn}^{4 +}$
D
$[{SnO}_{2}] {SnO}_{3}^{2 -}$

Solution:

${SnO}_{2} (s) + 2 KOH (aq) ⟶ K_{2} {SnO}_{3} (aq) + H_{2} O$
${SnO}_{3}^{2 -}$ ions would be preferentially adsorbed by SnO₂ particles.

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