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Question 42 of 58

Q.Name the compound employed to arrest bleeding.

(a) K2SO4⋅Al2(SO4)3⋅4Al(OH)3K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 4Al(OH)_3
(b) K2SO4⋅Al2(SO4)3⋅24Al(OH)3K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24Al(OH)_3
(c) K2SO4⋅Al2(SO4)3⋅4H2OK_2SO_4 \cdot Al_2(SO_4)_3 \cdot 4H_2O
(d) K2SO4⋅Al2(SO4)3⋅24H2OK_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O
Tamil Nadu DgeTamil Nadu HSC (DGE) Board 2017MCQ· 1mImportance★★★★★
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Potash alum, the double sulfate of potassium and aluminium with 24 water molecules of hydration, acts as an astringent/styptic that constricts small blood vessels and helps stop bleeding.

Potash alum's aluminium ions have an astringent action on tissue, causing local vasoconstriction and coagulation of surface proteins, which is why alum blocks (styptic pencils) are traditionally used to stop bleeding from small nicks and cuts. Its correct formula, as a double salt, is K2SO4⋅Al2(SO4)3⋅24H2OK_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O — the other options alter the water of …

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