Question

To stop bleeding from an injury ferric chloride can be applied. Which comment about the statement is justified?
A.It is not true, ferric chloride is a poison.
B.It is true; $F{e^{3 + }}$ ions coagulate blood which is negatively charged sol.
C.It is not true, $C{l^ - }$ ions form positively charged sol, profuse bleeding takes place.
D.It is true; coagulation takes place because of formation of negatively charged sol with $C{l^ - }$ ions.
E.It is not true; ferric chloride is ionic and gets into the bloodstream.

Answer 1

Coagulation is the process in which the chemicals are added that cause the small particles to suspend in water and clump together. These chemicals are added to coagulate the water and combine the non-setting particles together into larger and heavier masses of solids known as flocs.

Complete step by step answer:
The mixture whose particles are in the range of 1 and 100 nanometres in diameter but still they remain evenly distributed throughout the solution is known as colloid. Such solutions are also known as dispersions because the substance remains dispersed and does not settle in the container at its bottom.
The colloid in which the dispersed medium is the liquid and dispersed phase is solid is known as sol. The sols are formed in the continuous liquid medium by the small solid particles. They are quite stable and show the Tyndall effect as well.
In order to stop the bleeding during the injury ferric chloride is used because ions coagulate and they are negatively charged solutions and the ions coagulate since they are positively charged in nature. Blood is the colloidal solution and it follows Hardy –Schulze’s rule: “Higher the charge on the cation higher will be the coagulation of the colloidal solution or higher will be the coagulation power of the cation”.
Thus due to this very reason to stop bleeding from an injury ferric chloride can be applied and the option B. is the correct answer.

Note:
The scattering of the light particles in a colloid or in a very fine suspension is known as the Tyndall effect. Due to this effect the blue colour scatters the most than the red colour and this phenomenon is observed in the day to day life.