Compounds of Tin, Mercury, Arsenic, and Copper Are No Longer

Multiple Choice

Compounds of tin, mercury, arsenic, and copper are no longer used to prevent microbial growth in cooling water primarily because

A) antibiotics are cheaper.
B) other chemicals were shown to be much more effective.
C) microbes developed resistance to these metals.
D) their use contributes to serious pollution of natural waters.
E) All of the answer choices are correct.