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Arrange the following electrolytes in the increasing order of coagulation power for the coagulation of \( \mathrm{As}_{2} \mathrm{~S}_{3} \) sol:
\[
\begin{array}{llll}
\mathrm{K}_{2} \mathrm{SO}_{4} & \mathrm{CaCl}_{2} & \mathrm{Na}_{3} \mathrm{PO}_{4} & \mathrm{AlCl}_{3}
\end{array}
\]
(a) I \( \) II \( \) III \( \) IV
(b) I \( = \) III \( \) II \( \) IV
(c) II \( \) IV \( \) I \( \) II
(d) II \( \) III \( \) IV \( \) I
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