11 SKILL LEVEL
Proficient
Which substance conducts electricity in the liquid state but is a
poor conductor in the solid state?

a: Li₂O
b: SeCl2
C: P205
d: Hg

a: Li₂O

Explanation:

Ionic compounds are good conductors only in liquid state. They do not conduct electricity in their solid state.

The only ionic compound from the given choices is  Li₂O.

Ionic compound do not conduct electricity in their solid state because their ions are locked and are not free to move about their fixed lattice. In liquid states, they go into solution and they are free to move thereby acting as a good conductor.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

i believe the answer is three water molecules