Chemistry

Question Analysis
This question involves electrical conductivity of ionic compounds. The main focus is on the mobility of ions in different physical states (solid vs. aqueous) and how this affects conductivity.

Key Concept Explanation
Ionic compounds can conduct electricity when molten or dissolved in water because the ions are free to move and carry electric charge. In the solid state, the ions are fixed in a rigid crystal lattice and cannot move, so they do not conduct electricity.

Step-by-step Solution
1. Identify the state of NaCl: Solid and aqueous (dissolved in water).
2. Recall the property of ionic compounds in the solid state: Ions are fixed in a rigid crystal lattice and cannot move.
3. Recall the property of ionic compounds in the aqueous state: Ions are free to move and can carry electric charge.
4. Therefore, in solid Na...