Ferric chloride is applied to stop bleeding because

Options

ABlood absorbs ${FeCl}_{3}$ and forms a complex.
B ${Cl}^{-}$ ions cause coagulation of blood.
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.

Correct answer

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

Step-by-step solution

Ferric chloride is a hemostatic agent, which means that it can be used to stop bleeding by promoting the coagulation of blood. Blood is a colloidal solution of an albuminoid substance and can be coagulated to form clot by applying ${Fe}^{3 +}$ ion on the open wound. Thus, bleeding caused by a razor during shaving can be treated by rubbing potash alum against the cut which helps in the coagulation of the blood by sealing the blood vessels.

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