Which of the following is most effective in causing the coagulation of ferric hydroxide sol?

A
KCI
B
KNO₃
C
$K_{2} {SO}_{4}$
D
$K_{3} [Fe (CN)_{6}]$

Solution:

$Fe (OH)_{3} is positive sol. K_{3} [Fe (CN)_{6}]$ will provide ${[Fe (CN)_{6}]}^{3 -}$ for coagulation having highest magnitude of -ve charge among given options.

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