The flocculating power of the given ions for the specified...

The flocculating power of the given ions for the specified colloidal sols will be such that

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Arsenic sulphoid sol	Ferric hydroxide sol
${\left[Fe{\left(CN\right)}_{6}\right]}^{4 -} > P{O}_{4}^{3 -} > S{O}_{4}^{2 -} > Cl^{-}$	$Al^{3 +} > Ba^{2 +} > Na^{+}$

B

Arsenic sulphoid sol Ferric hydroxide sol

$Al^{3 +} > Ba^{2 +} > Na^{+}$ \left[Fe\left(CN\right)6\right]4 - > P{O}_{4}^{3 -} > S{O}_{4}^{2 -} > Cl^{-}

Arsenic sulphoid sol	Ferric hydroxide sol
$Na^{+} > Ba^{2 +} > Al^{3 +}$	$Cl^{-} > S{O}_{4}^{2 -} > P{O}_{4}^{3 -} > {\left[Fe{\left(CN\right)}_{6}\right]}^{4 -}$

Arsenic sulphoid sol	Ferric hydroxide sol
$Cl^{-} > S{O}_{4}^{2 -} > P{O}_{4}^{3 -} > {\left[Fe{\left(CN\right)}_{6}\right]}^{4 -}$	$Na^{+} > Ba^{2 +} > Al^{3 +}$

Arsenic sulphoid sol	Ferric hydroxide sol
$Al^{3 +} > Ba^{2 +} > Na^{+}$	\left[Fe\left(CN\right)6\right]4 - > P{O}_{4}^{3 -} > S{O}_{4}^{2 -} > Cl^{-}

Coagulation power depends on nature of charge and amount of charge
Coagulation power

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charge on ion of electrolyte
As Arsenic sulphoid sol is negatively charged so for it cations will cause precipitation of ions and the order is

Al^{3 +} > Ba^{2 +} > Na^{+}

As Ferric hydroxide sol is positively charged so for it anions will cause precipitation of ions and the order is

{\left[Fe{\left(CN\right)}_{6}\right]}^{4 -} > P{O}_{4}^{3 -} > S{O}_{4}^{2 -} > Cl^{-}