Which of the following is most effective in causing the coagulation of ferric hydroxide sol? (a)...

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Which of the following is most effective in causing the coagulation of ferric hydroxide sol?
(a) \( \mathrm{KCl} \)
(b) \( \mathrm{KNO}_{3} \)
(c) \( \mathrm{K}_{2} \mathrm{SO}_{4} \)
(d) \( \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
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