Which of the following is most powerful to coagulate the negative colloid? (a) \( \mathrm{ZnSO}_...

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Which of the following is most powerful to coagulate the negative colloid?
(a) \( \mathrm{ZnSO}_{4} \)
(b) \( \mathrm{Na}_{3} \mathrm{PO}_{4} \)
(c) \( \mathrm{AlCl}_{3} \)
(d) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
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