Question

Ferric chloride is applied to stop bleeding because-

• A. Fe³⁺ ions coagulate blood which is a negatively charged sol.
• B. FeCl₃ reacts with the constituents of blood which is a positively charged sol.
• C. Blood absorbs FeCl₃ and forms a complex.
• D. Cl^– ions cause coagulation of blood.

Answer 1

The Correct Option is A

Step 1: Understanding the coagulation process 
Blood exists as a negatively charged sol. When ferric chloride (FeCl$_3$) is introduced, the Fe$^{3+}$ ions interact with the negatively charged blood sol, causing it to coagulate. This occurs due to the electrostatic attraction between the positively charged Fe$^{3+}$ ions and the negatively charged blood particles. 
Step 2: The role of \(Fe^{3+} ions\) 
The Fe$^{3+}$ ions neutralize the negative charge on the blood particles, leading to their aggregation and coagulation. This explains why Fe$^{3+}$ ions are responsible for facilitating the coagulation of blood.