JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Surface Chemistry

Ferric chloride is applied to stop bleeding because:

(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.✓ Correct
(D) $FeCl_{3}$ reacts with the constituents of blood which is a positively charged sol.

Answer: (C)

Solution

Blood is a negatively charged colloidal sol. When ferric chloride is applied, the

Fe^{3 +}

ions (which are positively charged) neutralize the negative charges on the blood colloid particles, causing coagulation. This is an example of coagulation by electrolytes, where oppositely charged ions cause precipitation of the colloidal particles.

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option

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