Question

6. To stop bleeding, FeCl3, is applied locally because:
(a) FeCl3, seals the blood vessels
(b) FeCl3, changes the direction of blood flow
(c) FeCl3, reacts with blood to form a solid substance which
seals the blood vessel
(d) FeCl3, causes denaturation of proteins present in blood
​

Answer 1

Answer:

FeCl 3 is acidic in nature and when added to blood it decreases the pH of blood and denatures the globular proteins present in blood takes place and these globular proteins becomes fibrous which are insoluble and stop bleeding.

So correct answer is D.

Answer 2

The answer is (D) FeCl₃ causes denaturation of proteins present in the blood.

​FeCl₃ is a lewis acid. An acid when added to a solution usually decreases the pH of the solution. So, FeCl₃ when added to blood makes the medium acidic. Due to this acidic medium, the denaturation of the globular proteins in the blood occurs. The denatured globular proteins become fibrous and insoluble in nature and hence the bleeding is stopped by the formation of a clot.

What are Lewis acids?

Lewis acids are capable of accepting a pair of electrons from a suitable donor.