Ferric chloride is applied to stop bleeding because:
(1) Cl ions cause coagulation of blood.
(2) Blood absorbs FeCl3 and forms a complex.
(3) Fe3+ ions coagulate blood which is a negatively charged sol.
(4) FeCl3 reacts with the constituents of blood which is a positively charged sol.

Answer: Option 3
Blood is a colloidal suspension, and it carries a net negative charge due to the presence of negatively charged ions and molecules, such as proteins and ions like chloride ions (Cl). When blood is flowing, it is in a liquid state and is considered a negatively charged sol.
Ferric chloride contains Fe3+ ions, which are positively charged. When ferric chloride is applied to a wound, the Fe3+ ions interact with the negatively charged blood, causing the blood to coagulate and form a clot. This stops the bleeding and allows the wound to heal.
Option 1 is incorrect because Cl ions do not cause coagulation of blood. Option 2 is incorrect because blood does not absorb FeCl3 to form a complex. Option 4 is incorrect because blood is not a positively charged sol.

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