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Surface Chemistry — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry1 Mark
Question
Why does bleeding stop by rubbing moist alum?
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Answer

Blood is a colloidal sol. When we rub the injured part with moist alum then coagulation of blood takes place. Hence, main reason is coagulation, which stops the bleeding.

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