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.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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