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Q.

Which of the following is most effective in coagulating a ferric hydroxide sol ?

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a

KCl

b

KNO3

c

K2SO4

d

K3[Fe(CN)6]

answer is C.

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Detailed Solution

Ferric hydroxide ia a positive sol and so negative anions will be responsible for its coagulation. Higher the negative charge, effective will be the coagulation.
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