Why does bleeding stop by rubbing moist alum?

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Solution

Blood is a colloidal solution of an albuminoid substance. So, it contains charged protein molecules.

Moist alum has highly charged $A l^{+ 3} and S O_{4}^{2 -}$ ions which neutralize the charged protein molecules present in blood. This results in coagulation of blood, forming a clot which stops further bleeding.

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