Which of the following compounds was used by the ancient Egyptians and is still used today to remove visible impurities in water?
A) Sand (SiO2)
B) Aluminum(III) hydroxide (Al(OH) 3)
C) Slaked lime (Ca(OH) 2)
D) Alum (KAl(SO4) 2)
E) Chlorine (Cl2)
Correct Answer:
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