Passing Arsenic Contaminated Water Through a Long Pipe Filled with Sand

question 54

Multiple Choice

Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to removal of the arsenic by

• A)a physical change.
• B)an oxidation-reduction reaction.
• C)ion exchange.
• D)filtering out the suspended arsenic particles.
• E)only a and b

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