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

Question

Quizplus · Accepted Answer

Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to an oxidation-reduction reaction, where the iron powder reduces the arsenic, converting it to a lower oxidation state and adsorbing it onto the iron particles, which get trapped in the sand filter. This process effectively removes the arsenic from the water.

Passing Arsenic Contaminated Water Through a Long Pipe Filled with Sand