Final answer:
Perchloric acid in water is a good conductor of electricity because it forms hydronium ions that allow for the conduction of electricity. Distilled water and perchloric acid separately do not conduct electricity because they do not contain ions.
Step-by-step explanation:
Solutions of perchloric acid in water are good conductors of electricity because perchloric acid is an acid and when it dissolves in water, it forms hydronium ions (H3O+). These ions are responsible for conducting electricity. Distilled water and perchloric acid separately do not conduct electricity because they do not contain ions.