(C) Blood is a colloidal system which is negatively charged. According to the Hardy-Schulze rule,the coagulating power of an ion is directly proportio

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$Fe^{3+}$ ions coagulate blood which is a negatively charged sol.

(C) Blood is a colloidal system which is negatively charged. According to the Hardy-Schulze rule,the coagulating power of an ion is directly proportional to its valency. $Fe^{3+}$ ions,being highly positively charged,effectively neutralize the negative charge on the blood colloids,leading to coagulation and stopping the bleeding.

Class 12 Chemistry Surface Chemistry Colloids, Emulsion, Gel and Their properties with application

Medium

Ferric chloride is applied to stop bleeding because:

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A
$Cl^{-}$ ions cause coagulation of blood.
B
Blood absorbs $FeCl_3$ and forms a complex.
C
$Fe^{3+}$ ions coagulate blood which is a negatively charged sol.
D
$FeCl_3$ reacts with the constituents of blood which is a positively charged sol.