Ferric chloride is applied to stop bleeding because -

<p>The correct answer is <strong>Option D: Fe³⁺ ions coagulate blood which is a negatively charged sol.</strong></p> <p>Blood is a colloidal solution, which means that it is made up of small particles suspended in a liquid. The particles in blood are negatively charged, and the negative charge prevents the particles from clumping together. When ferric chloride is applied to a bleeding wound, the Fe³⁺ ions in the ferric chloride react with the negatively charged particles in the blood. This reaction causes the particles to clump together, forming a clot that stops the bleeding.</p> <p>The other options are incorrect:</p> <ul> <li>Option A is incorrect. Blood is not a positively charged sol.</li><br/> <li>Option B is incorrect. Blood does not absorb ferric chloride.</li><br/> <li>Option C is incorrect. Cl^- ions do not cause coagulation of blood.</li> </ul>