Which of the following is most effective...

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

A

KCl

B

`KNO_(2)`

C

`K_(2)SO_(4)`

D

`K_(3)[Fe(CN)_(6)]`

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The correct Answer is:

D

Effectiveness of coagulation by electrolyte `prop` charge on coagulating ion.

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