Author Question: Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to ... (Read 33 times)

ARLKQ · **on:** Jul 29, 2018

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 2

Treating water with chlorine or ozone during water purification is an example of

A) a physical change.
B) a chemical reaction.
C) ion exchange.
D) a solid dissolving in a liquid.
E) only a and b