Which of the following is most effective in causing the coagulation of ferric hydroxide sol :- \...

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Which of the following is most effective in causing the coagulation of ferric hydroxide sol :-
\( \mathrm{P} \)
(1) \( \mathrm{KCl} \)
(2) \( \mathrm{KNO}_{3} \)
(3) \( \mathrm{K}_{2} \mathrm{SO}_{4} \)
(4) \( \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
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