MCQ
Which of the following electrolytes will have maximum coagulating value for $\text{AgI}/ \text{Ag}^+$ sol?
  • A
    $\text{Na}_2\text{S}$
  • $\text{Na}_3\text{PO}_4 $
  • C
    $\text{Na}_2\text{SO}_4$
  • D
    $\text{NaCl}$

Answer

Correct option: B.
$\text{Na}_3\text{PO}_4 $
According to Hardy$-$Schulze law, the greater the charge on anion, the greater will be its coagulating power.
Electrolytes Anionic part Charge on anion
$\text{Na}_2\text{S}$ $\text{S}^{2-}$ $2$
$\text{Na}_3\text{PO}_4 $ $\text{PO}_4^{3-}$ $3$
$\text{Na}_2\text{SO}_4$ $\text{SO}_4^{2-}$ $2$
$\text{NaCl}$ $\text{Cl}^-$ $1$
Here$, \text{PO}_4^{3-}$ have highest charge. hence$, \text{PO}_4^{3-}$ have highest coagulating power.

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