The correct answer is D. Potash alum.
Potash alum is a double salt of potassium aluminum sulfate. It is a white, crystalline solid that is soluble in water. Potash alum has been used for centuries to stop bleeding. It works by forming a clot on the
wound, which helps to stop the bleeding.Aluminium nitrate is a white, crystalline solid that is soluble in water. It is used in the manufacture of explosives, pigments, and other chemicals. Aluminium nitrate is not used to stop bleeding.
Aluminium sulphate is a white, crystalline solid that is soluble in water. It is used in the manufacture of paper, textiles, and other chemicals. Aluminium sulphate is not used to stop bleeding.
Aluminium chloride is a white, crystalline solid that is soluble in water. It is used in the manufacture of aluminum products, such as cans and foil. Aluminium chloride is not used to stop bleeding.
Potash alum is the only option that is a double salt of potassium aluminum sulfate. It is also the only option that is used to stop bleeding.