A) co-agulation of negatively charged blood particles by \[\text{F}{{\text{e}}^{\text{3+}}}\] ions
B) co-agulation of positively charged blood particles by\[\text{C}{{\text{l}}^{-}}\] ions
C) reaction taking place between ferric ions and the haemoglobin forming a complex
D) common element, iron, in both \[\text{FeC}{{\text{l}}_{\text{3}}}\] and haemoglobin
Correct Answer: A
Solution :
Bleeding due to cut can be stopped by applying \[\text{FeC}{{\text{l}}_{\text{3}}}\]or alum solution. This is due to coagulation of negatively charged colloidal blood particles (albuminoid substance) by positively charged \[\text{F}{{\text{e}}^{\text{3+}}}\]ions. These substances are used as styptic (which check the flow of blood).
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